单选题The deep-sea listening system makes use of ______.A the sophisticated technology of focusing sounds under waterB the capability of sound to travel at high speedC the unique property of layers of ocean water in transmitting soundD low-frequency sounds t

题目
单选题
The deep-sea listening system makes use of ______.
A

the sophisticated technology of focusing sounds under water

B

the capability of sound to travel at high speed

C

the unique property of layers of ocean water in transmitting sound

D

low-frequency sounds traveling across different layers of water

相似考题

1.187. It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior. So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans. Tracking whales is but one example of all exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies. Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures. The speed of sound in water is roughly one mile a second, slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. [共5题](1) The passage is chiefly about ________.(A) an effort to protect an endangered marine species(B) the exposure of a US Navy top-secret weapon(C) the civilian use of a military detection system(D) a new way to look into the behavior. of blue whales(2) The underwater listening system was originally designed ________.(A) to monitor deep-sea volcanic eruptions(B) to replace the global radio communications network(C) to study the movement of ocean currents(D) to trace and locate enemy vessels(3) The deep-sea listening system makes use of ________.(A) the unique property of layers of ocean water in transmitting sound(B) the capability of sound to travel at hligh speed(C) low-frequency sounds travelling across different layers of water(D) the sophisticated technology of focusing sounds under water(4) It can be inferred from the passage that ________.(A) blue whales are no longer endangered with the use of the new listening system(B) new radio devices should be developed for tracking the endangered blue whales(C) military technology has great potential in civilian use(D) opinions differ as to whether civilian scientists should be allowed to use military technology(5) Which of the following is true about the US Navy underwater listening network?(A) It has been replaced by a more advanced system.(B) It is now partly accessible to civilian scientists.(C) It became useless to the military after the cold war.(D) It is indispensable in protecting endangered species.

2.You are developing a Windows Communication Foundation (WCF) service that must be discoverable.You need to ensure that the ServiceHost instance supports multiple discovery versions.What should you do?（）A. - Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use the same value for the Address property of each endpoint.B. - Use the endpoint constructor without the DiscoveryVersion parameter. - Use a unique value for the Address property of each endpoint.C. - Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use a unique value for the Address property of each endpoint.D. - Use the endpoint constructor without the DiscoveryVersion parameter. - Use the same value for the Address property of each endpoint.

3.For users, microkernel technology promises(11), compact and sophisticated operating systems that are typically(12) across a range of hardware platforms.A．quicklyB．speedC．slowD．fast

4.Your quotation ()but the listed payment conditions are not customary in our trade.A、sounds interestingB、sound interestinglyC、seems interestinglyD、seem well

更多“单选题The deep-sea listening system makes use of ______.A the sophisticated technology of focusing sounds under waterB the capability of sound to travel at high speedC the unique property of layers of ocean water in transmitting soundD low-frequency sounds t”相关问题

  • 第1题：

    Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?()

    A. optical technology for transmitting up to 32 channels over multiple fiber strands

    B. optical technology for transmitting up to 16 channels over multiple fiber strands

    C. a WDM system that is compatible with EDFA technology

    D. a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .


    参考答案：C, D

  • 第2题：

    The last sentence means that a knowledge of fish sounds can help man to ______.

    A. avoid confusion in fishing activity

    B. avoid unneeded effort in fish sound studies

    C. detect enemy submarines

    D. pick up new sounds


    正确答案：C
    答案为C。根据第二段第三句及最后一句，He can also apply this information to the more effective utilization of the listening spots he has set up to detect enemy submarines... and the sound sentry must decide whether or not to call an alarm作出该项选择。

  • 第3题：

    The soundings on the chart are based on the depth of water available at ______.

    A.mean low water

    B.mean lower low water

    C.mean high water

    D.mean high water springs


    正确答案：B

  • 第4题：

    A vessel not under command sounds the same fog signal as a vessel ______.

    A.engaged in towing

    B.constrained by her draft

    C.under sail

    D.All of the above


    正确答案：D
    失控船鸣放的雾号与从事拖带作业的船，限于吃水船，帆船的雾号一样

  • 第5题：

    For each blank，choose the best answer from the four choices and write down on the answer sheet.
    （ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
    （请作答此空）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
    （ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
    （ ）is the popular LAN developed under the direction of the IEEE 802.5.
    （ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

    A.ISO
    B.ANSI
    C.CCITT
    D.IEEE

    答案：D
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
    IEEE是由多个研究底层协议的机构组成的权威组织。
    以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
    令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
    光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
    较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
    具有较大的带宽，FDDI的设计带宽为100Mbit/s。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
    光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第6题：

    For each blank，choose the best answer from the four choices and write down on the answer sheet.
    （ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
    （ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
    （请作答此空）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
    （ ）is the popular LAN developed under the direction of the IEEE 802.5.
    （ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

    A.The hub
    B.The bridge
    C.The router
    D.The proxy

    答案：B
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
    IEEE是由多个研究底层协议的机构组成的权威组织。
    以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
    令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
    光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
    较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
    具有较大的带宽，FDDI的设计带宽为100Mbit/s。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
    光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第7题：

    （ ）is the popular backbone technology for transmitting information at high
    speed with a high level of fault tolerance which is developed under the
    direction of ANSI.

    A.X.25
    B.ATM
    C.FDDI
    D.DQDB

    答案：C
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。IEEE是由多个研究底层协议的机构组成的权威组织。以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。令牌环网是一种符合IEEE 802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。具有较大的带宽，FDDI的设计带宽为100Mbit/s。具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第8题：

    Dense Wavelength Division Multiplexing (DWDM) is an important innovation in optical networks.Which two descriptions best define DWDM?（）

    • A、optical technology for transmitting up to 32 channels over multiple fiber strands
    • B、optical technology for transmitting up to 16 channels over multiple fiber strands
    • C、a WDM system that is compatible with EDFA technology
    • D、a technology for transmitting more closely packed optical signals using more sophisticated transceiver designs than CWDM .

    正确答案:C,D

  • 第9题：

    单选题
    The underwater listening system was originally designed ______.
    A

    to trace and locate enemy vessels

    B

    to monitor deep-sea volcanic eruptions

    C

    to study the movement of ocean currents

    D

    to replace the global radio communications network


    正确答案： D
    解析：
    细节题。第二段末句，水下声控系统，在过去几十年里建起来的用来追踪潜在敌人舰只的，只有A项合文意。

  • 第10题：

    单选题
    After teaching sounds, a teacher makes a test that aims to find out which sounds students are and are not able to pronounce. This test belongs to _____.
    A

    aptitude test

    B

    proficiency test

    C

    achievement test

    D

    diagnostic test


    正确答案： D
    解析：
    学习过语音之后，教师做测试以便检查学生哪些音会发，哪些音不会发，这属于diagnostic test（诊断性测验）的内容。

  • 第11题：

    多选题
    What two descriptions best define DWDM？ （）
    A

    a WDM system that is compatible with EDFA technology

    B

    an optical technology for transmitting up to 16 channels over multiple fiber strands

    C

    an optical technology for transmitting up to 32 channels over multiple fiber strands

    D

    a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM

    E

    a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM


    正确答案： B,A
    解析： 暂无解析

  • 第12题：

    单选题
    The deep-sea listening system makes use of ______.
    A

    the sophisticated technology of focusing sounds under water

    B

    the capability of sound to travel at high speed

    C

    the unique property of layers of ocean water in transmitting sound

    D

    low-frequency sounds traveling across different layers of water


    正确答案： D
    解析：
    细节题。最后一段叙述了不同海水层可充当声音传播的频道。听诊器的工作原理与此相同，把声音汇集起来，也正是这种声音汇集才能把大海里甚至微弱的声音，特别是那些低频的声音，传播至数千里之外。A项讲述的是听诊器的技术，非海水传音原理，与文中内容不符。只有C项与原文内容相符。

  • 第13题：

    Passage Four

    Most people do not think of fishes and other sea animals as having voices, and of those who are aware of the fact that many of them can "speak", few understand that these "conversations" have significance. Actually, their talk may be as meaningful as much of our own. For example, some sea animals use their "voices" to locate their food in the ocean expanses (广阔的区域); others use their "voices" to let their fellows know of their locations; and still others, as a means of obtaining mates. Sometimes, "speaking" may even mean the difference between life and death to a sea animal. It appears in some cases that when a predator (食肉动物) approaches, the prey (被捕的动物) depends on no more than the sounds it makes to escape.

    Fish sounds are important to man, also. By listening to them, he can learn a great deal about he habits of creatures that make them, the size of the School they form, the patterns of their migrations, and the nature of the environments in which they live. He can also apply this nformation to the more effective utilization of the listening spots he has set up to detect enemy submarines (潜水艇). A knowledge of fish sounds can avoid confusion and unneeded effort when a "new" sound is picked up and the sound sentry (哨兵) must decide whether or not to call an alarm.

    46. Among the people who know that many sea animals have voices, few ______.

    A. know the meaning of their conversations

    B. realize that they can communicate with each other

    C. realize that they can make speeches

    D. could understand their conversations


    正确答案：A
    答案为A。根据第一段第一句， and of those who are aware of the fact that many of them can "speak", few understand that these "conversations' have significance 符合题意。其他选项在文中没有提及。

  • 第14题：

    根据以下材料，回答 40～43 问题。

    During a television play the sound man must be ready to make every sound as it is needed．Sound effects are of three kinds：real，imitated and recorded．

    Real sounds are those of doorbells，telephone bells，and other small objects easy to keep in a studio． But the sound man must imitate many sounds． For bacon fryin9，he crumples cellophane paper．A long sheet of metal hanging in a doorway makes thunder·He taps one rubber sink plunger and then another on a table to imitate a horse walking on pavement． For a horse galloping along a gravel road，the sound man can use the two halves of a coconut，pounding each in turn very fast on the table．

    Recorded sound effects are used for noises he cannot himself produce offstage．He pays records for such sounds as a rooster crowing， a train leaving a station， and a baby crying．

    The sound man is an important part of any television production．

    第 40 题 The sound man is important because he________

    A．is kept busy

    B．makes fl TV play more lifelike

    C．1ets an actor know when to life a telephone receiver

    D．is always learning new methods


    正确答案：B
    从文章中很容易就能判断出答案。

  • 第15题：

    The most serious effect of air trapped in a diesel engine jacket water cooling system is that it ______．

    A.Causes colloid suspension in the cooling water

    B.Reduces the capability of the lubrication system

    C.Can form pockets which block the flow of coolant through the system

    D.Leads to the scuffing of cylinder walls


    正确答案：D

  • 第16题：

    After teaching sounds, a teacher makes a test that aims to find out which sounds students are not able to pronounce. This test belongs to__________.

    A. aptitude test
    B. proficiency test
    C. achievement test
    D. diagnostic test

    答案：D
    解析：
    考查教学评价。教了语音之后，教师做测试以便检查学生哪些音不会发，这属于诊断性测验(diagnostic test)。aptitude test“能力倾向测验”，proficiency test“水平测试”，achievement test“成就测试”。

  • 第17题：

    For each blank，choose the best answer from the four choices and write down on the answer sheet.
    （请作答此空）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
    （72）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
    （73）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
    （74）is the popular LAN developed under the direction of the IEEE 802.5.
    （74）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.

    A.The MAC address
    B.The IP address
    C.The subnet address
    D.The virtual address

    答案：A
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
    IEEE是由多个研究底层协议的机构组成的权威组织。
    以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
    令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
    光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
    较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
    具有较大的带宽，FDDI的设计带宽为100Mbit/s。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
    光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第18题：

    （ ）is the popular LAN developed under the direction of the IEEE 802.5.（ ）is the popular backbone technology for transmitting information at high
    speed with a high level of fault tolerance which is developed under the
    direction of ANSI.

    A.Ethernet,FDDI
    B.Token Bus,Ethernet
    C.Token Ring，FDDI
    D.DQDB,QinQ

    答案：C
    解析：
    MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。IEEE是由多个研究底层协议的机构组成的权威组织。以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。令牌环网是一种符合IEEE 802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。
    具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。

  • 第19题：

    There wouldn’t be enough water for us if we didn’t_________.

    A.turn to the oceans for more water
    B.reuse used water and make use of seawater
    C.desalt seawater
    D.take steps to reuse all water on earth

    答案：B
    解析：

  • 第20题：

    What two descriptions best define DWDM？ （）

    • A、 a WDM system that is compatible with EDFA technology
    • B、 an optical technology for transmitting up to 16 channels over multiple fiber strands
    • C、 an optical technology for transmitting up to 32 channels over multiple fiber strands
    • D、 a technology for transmitting multiple optical signals using less sophisticated transceiver designthen CWDM
    • E、 a technology for transmitting more closely packed optical signals using more sophisticatedtransceiver designs than CWDM

    正确答案:A,E

  • 第21题：

    单选题
    A vessel not under command sounds the same fog signal as a vessel（）.
    A

    towing

    B

    constrained by her draft

    C

    under sail

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    You are developing a Windows Communication Foundation (WCF) service that must be discoverable.You need to ensure that the ServiceHost instance supports multiple discovery versions. What should you do?（）
    A

    - Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use the same value for the Address property of each endpoint.

    B

    - Use the endpoint constructor without the DiscoveryVersion parameter. - Use a unique value for the Address property of each endpoint.

    C

    - Specify a unique DiscoveryVersion parameter for each endpoint constructor. - Use a unique value for the Address property of each endpoint.

    D

    - Use the endpoint constructor without the DiscoveryVersion parameter. - Use the same value for the Address property of each endpoint.


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    After teaching sounds, a teacher makes a test that aims to find out which sounds students are not able to pronounce. This test belongs to_________
    A

    aptitude test

    B

    proficiency test

    C

    achievement test

    D

    diagnostic test


    正确答案： C
    解析：

  • 第24题：

    填空题
    What kind of sound does the mouse produce?It produces ____ sounds.

    正确答案： pleasant
    解析：
    简答填空题。从提示信息可推知，所缺内容有关描述声音的形容词。根据关键词句“Not only are the sounds pleasant”可知，鼠标发出的声音非常悦耳，故此处应填pleasant。
    【录音原文】
    　　Ladies and gentlemen, welcome to this electronics exhibition. Here you can find almost all of the latest products of our company. Let’s go to the hardware section first. Please follow me. The products on display in this section are specially designed for old people who wish to use a computer at home. Look at the keyboard. Its big keys are particularly easy to use for those whose eye sight is not good enough. Here, please take a close look at the mouse. It can fit all sizes of hands. Besides, it has a special sound effect. Listen. Not only are the sounds pleasant, but the two buttons give out different sounds. Now I’ll give you three minutes to try for yourselves, then we’ll go to the software section.
    Q11: What can visitors see at the exhibition?
    Q12: Which section do the visitors go to see first?
    Q13: For whom are the products specially designed?
    Q14: What’s special about the keyboard?
    Q15: What kind of sound does the mouse produce?

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