单选题The first few steps in the employment process are relatively inexpensive to the company, and each may indicate basic reasons ______ the applicant is unsuitable for the job.A becauseB whyC forD that

题目
单选题
The first few steps in the employment process are relatively inexpensive to the company, and each may indicate basic reasons ______ the applicant is unsuitable for the job.
A

because

B

why

C

for

D

that


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  • 第1题:

    He had developed theories that were profound and _____of exciting relatively few scientists.

    A. incapable

    B. able

    C. capable

    D. inept


    参考答案:C

  • 第2题:

    What steps do you take to determine the bottleneck of a slow running ETL process?

    如果ETL进程运行较慢,需要分哪几步去找到ETL系统的瓶颈问题。


    正确答案:
    答:ETL系统遇到性能问题,运行很慢是一件较常见的事情,这时要做的是逐步找到系统的瓶颈在哪里。
    首先要确定是由CPU、内存、I/O和网络等产生的瓶颈,还是由ETL处理过程产生的瓶颈。
    如果环境没有瓶颈,那么需要分析ETL的代码。这时,我们可以采用排除的方法,需要隔离不同的操作,并分别对它们进行测试。如果是采用纯手工编码方式的ETL处理,隔离不同的操作要麻烦一些,这时需要根据编码的实际情况来处理。如果是采用ETL工具的话,目前的ETL工具应该都有隔离不同处理的功能,隔离起来相对容易一些。
    分析最好从抽取操作开始,然后依次分析各种计算、查找表、聚集、过滤等转换环节的处理操作,最后分析加载操作。
    实际的处理中,可以按照下面的七个步骤来查找瓶颈。
    1.隔离并执行抽取查询语句。
    先将抽取部分隔离出来,去掉转换和交付,可以将数据直接抽取到文件中。如果这一步效率很差,基本确定是抽取SQL的问题。从经验来看,未经调优的SQL是一个最常见的导致ETL效率差的原因。如果这步没有问题进入第二步。
    2.去掉过滤条件。
    这一条是针对全抽取,然后在ETL处理中进行过滤的处理方式而言。在ETL处理中做过滤处理有时会产生瓶颈。可以先将过滤去掉,如果确定为这个原因,可以考虑在抽取时进行数据过滤。
    3.排除查找表的问题。
    参照数据在ETL处理过程中通常会加载到内存中,目的是做代码和名称的查找替换,也称查找表。有时查找表的数据量过大也会产生瓶颈。可以逐个隔离查找表,来确定是否是这里出现问题。注意要将查找表的数据量降到最低,通常一个自然键一个代理键就可以,这样可以减少不必要的数据I/O。
    4.分析排序和聚集操作。
    排序和聚集操作都是非常费资源的操作。对这部分隔离,来判断是否因为它们引起性能问题。如果确定是因为这个,需要考虑是否可以将排序和聚集处理移出数据库和ETL工具,移到操作系统中来处理。
    5.隔离并分析每一个计算和转换处理。
    有时转换过程中的处理操作也会引起ETL工作的性能。逐步隔离移除它们来判断哪里出了问题。要注意观察像默认值、数据类型转换等操作。
    6.隔离更新策略。
    更新操作在数据量非常大时是性能非常差的。隔离这部分,看看是否这里出了问题。如果确定是因为大批量更新出了性能问题。应该考虑将insert、update和delete分开处理。
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    如果前面各部分都没有问题,最后需要检测是目标数据库的性能问题。可以找个文件代替数据库,如果性能提高很多,需要仔细检测目标数据库的加载过程中的操作。例如是否关闭了所有的约束,关闭了所有的索引,是否使用了批量加载工具。如果性能还没有提高,可以考虑使用并行加载策略。

  • 第3题:

    The first step in the continuous improvement is to ( ).




    A. identify improvement strategies
    B. collect data
    C. identify of measurement target
    D. process data

    答案:A
    解析:
    持续改进的第一步是( )。A.识别改进策略 B.收集数据 C.识别测量目标 D.处理数据

  • 第4题:

    Lower the ladder two steps() ,please !

    • A、too
    • B、more
    • C、little
    • D、few

    正确答案:B

  • 第5题:

    There are 3 steps to confirm whether a range of IP address can be summarized. When of thefollowing is used in each of these 3 steps?()

    • A、 The first number in the contiguous block of addresses
    • B、 The last number in the contiguous block of addresses
    • C、 The size of the contiguous block of addresses
    • D、 The subnet mask of the original network address

    正确答案:A

  • 第6题:

    When using the steps to success methodology, where does Quote Builder fit into the deal process flow?()

    • A、It encompasses the validate and solve steps
    • B、It encompasses the Discovery, Validate and Solve steps
    • C、It encompasses the Discover, Validate, Solve and Present Steps
    • D、It encompasses the Discovery, Solve and Close steps
    • E、It encompasses the Discovery, Validate and Present Steps

    正确答案:A

  • 第7题:

    Which three steps are parts of the root password recovery process?()

    • A、Reboot the device
    • B、Run the recovery script
    • C、Reset the root password
    • D、Reset the user passwords
    • E、Load factory-default configuration

    正确答案:A,B,C

  • 第8题:

    单选题
    In the IS-IS Designated Intermediate System (DIS) election process, which criteria is used for DIS selection?()
    A

    highest router ID first, then highest priority

    B

    highest MAC address first, then highest priority

    C

    highest router ID first, then highest MAC address

    D

    highest priority first, then highest router ID

    E

    highest priority first, then highest MAC address


    正确答案: D
    解析: 暂无解析

  • 第9题:

    单选题
    Which statement is true about the digital to analog conversion process?()
    A

    the two steps of digital to analog conversion are decompression and reconstruction of the analog signal

    B

    the two steps of digital to analog conversion are decoding and filtering

    C

    the two steps of digital to analog conversion are decompression and filtering of the analog signal

    D

    the two steps of digital to analog conversion are quantization and decoding


    正确答案: C
    解析: 暂无解析

  • 第10题:

    单选题
    The first few steps in the employment process are relatively inexpensive to the company, and each may indicate basic reasons ______ the applicant is unsuitable for the job.
    A

    because

    B

    why

    C

    for

    D

    that


    正确答案: C
    解析:
    招聘过程的前几个步骤对于公司来说相对廉价,而且每个步骤都显示了为什么应聘者不适合这个工作的基本原因。why引导定语从句,并且表示因果关系,其他选项不具有这两项功能。故B项正确。

  • 第11题:

    单选题
    What is the first CoS process performed when a packet enters a JUNOS device?()
    A

    Rewrite Marker

    B

    Multifield Classifier

    C

    Policing

    D

    BA Classifier


    正确答案: A
    解析: 暂无解析

  • 第12题:

    单选题
    I guess the whole paper has to be rewritten; only the first few paragraphs may be()
    A

    sustained

    B

    contained

    C

    maintained

    D

    retained


    正确答案: A
    解析: 暂无解析

  • 第13题:

    I first heard this story _____ from a girl I had met in New York's Greenwich Village.

    A. since a few years

    B. a few years before

    C. for a few years

    D. a few years ago


    参考答案: D

  • 第14题:

    Multiple users report that their Windows 7 computers take longer to start than when their computers were first installed. A help desk technician reports that the problem is related to installed applications. You need to recommend a solution that identifies the applications that run during the startup process. What should you recommend?()

    A.Event Forwarding

    B.MSConfig.exe

    C.Problem Steps Recorder

    D.Reliability Monitor


    参考答案:B

  • 第15题:

    Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks?()

    • A、The three required steps in the analog to digital conversion are sampling,encoding,and compression.
    • B、The three required steps in the analog to digital conversion are sampling,quantization,and compression.
    • C、The three required steps in the analog to digital conversion are sampling,quantization,and encoding.
    • D、The output of the sampling process is a pulse code modulation (PCM) signal.
    • E、The output of the sampling process is a pulse amplitude modulation (PAM) signal.

    正确答案:C,E

  • 第16题:

    When a router converts analog signals to digital signals, what three steps are always included in the process?()

    • A、involution
    • B、encoding
    • C、sampling
    • D、quantization
    • E、compression
    • F、companding

    正确答案:B,C,D

  • 第17题:

    Which statement is true about the digital to analog conversion process?()

    • A、the two steps of digital to analog conversion are decompression and reconstruction of the analog signal
    • B、the two steps of digital to analog conversion are decoding and filtering
    • C、the two steps of digital to analog conversion are decompression and filtering of the analog signal
    • D、the two steps of digital to analog conversion are quantization and decoding

    正确答案:B

  • 第18题:

    An administrator logs into a server and notices slow performance.While troubleshooting the problem the administrator notices that an unfamiliar process in the Task Manager is running at 100% CPU usage.The administrator tries to end the task and receives ‘Access is denied’.  Which of the following steps would allow the administrator to terminate that process?()

    • A、Adding the ‘Run as a service’ permission to their account.
    • B、Running the kill utility.
    • C、Adding their account to the remote users group.
    • D、Ending the services.exe process then ending the runaway process.

    正确答案:B

  • 第19题:

    Multiple users report that their Windows 7 computers take longer to start than when their computers were first installed. A help desk technician reports that the problem is related to installed applications. You need to recommend a solution that identifies the applications that run during the startup process. What should you recommend?()

    • A、Event Forwarding
    • B、MSConfig.exe
    • C、Problem Steps Recorder
    • D、Reliability Monitor

    正确答案:B

  • 第20题:

    单选题
    Which of the following steps in the troubleshooting and repair process is MOST effectivereduce redundant effort? ()
    A

    Discuss the problem with the user and identify any recent changes.

    B

    Identify the root cause of the failure.

    C

    Verify the problem resolution.

    D

    Document activities and outcomes of repair steps.


    正确答案: D
    解析: 暂无解析

  • 第21题:

    多选题
    Which two statements are true about analog to digital conversion of voice signals for use in digital telephony networks?()
    A

    The three required steps in the analog to digital conversion are sampling,encoding,and compression.

    B

    The three required steps in the analog to digital conversion are sampling,quantization,and compression.

    C

    The three required steps in the analog to digital conversion are sampling,quantization,and encoding.

    D

    The output of the sampling process is a pulse code modulation (PCM) signal.

    E

    The output of the sampling process is a pulse amplitude modulation (PAM) signal.


    正确答案: B,E
    解析: 暂无解析

  • 第22题:

    单选题
    There are 3 steps to confirm whether a range of IP address can be summarized. When of thefollowing is used in each of these 3 steps?()
    A

     The first number in the contiguous block of addresses

    B

     The last number in the contiguous block of addresses

    C

     The size of the contiguous block of addresses

    D

     The subnet mask of the original network address


    正确答案: C
    解析: 暂无解析

  • 第23题:

    单选题
    When using the steps to success methodology, where does Quote Builder fit into the deal process flow?()
    A

    It encompasses the validate and solve steps

    B

    It encompasses the Discovery, Validate and Solve steps

    C

    It encompasses the Discover, Validate, Solve and Present Steps

    D

    It encompasses the Discovery, Solve and Close steps

    E

    It encompasses the Discovery, Validate and Present Steps


    正确答案: E
    解析: 暂无解析

  • 第24题:

    单选题
    There are seven basic steps of the core baseline process. Which one takes place first?()
    A

    Implement threshold monitoring using RMON.

    B

    Poll and record specific SNMP MIB objects from the device

    C

    Verify that the SNMP MIB is supported in the relevant core device.

    D

    Implement monitoring using SNMP or RMON.


    正确答案: D
    解析: 暂无解析