When we got there, the meeting()for half an hour.A. has been onB. has onC. was onD. had been on

题目
When we got there, the meeting()for half an hour.

A. has been on

B. has on

C. was on

D. had been on

相似考题

1.LTE系统支持的双工方式有：A、FDDB、TDDC、Half-duplexedFDDD、Half-duplexedTDD

2.You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?A．Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point linkB．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receiveC．Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidthD．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signalE．None of the above

3.The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?A．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receiveB．Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point linkC．Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidthD．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex ethernet uses a jam signalE．None of the above

4.计划的主要内容包括（），计划必须清楚地确定和描述这些内容。A.What，Why，Who，Where，When，Howmany，HowmuchB.What，Why，We，Where，When，Howto，HowmuchC.What，Why，We，Where，When，How，HowmuchD.What，Why，Who，Where，When，How，Howmuch

更多“When we got there, the meeting()for half an hour. ”相关问题

  • 第1题：

    When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

    A．Half-duplex Ethernet operates in a shared collision domain.

    B．Half-duplex Ethernet operates in an exclusive broadcast domain.

    C．Half-duplex Ethernet has efficient throughput.

    D．Half-duplex Ethernet has lower effective throughput.

    E．Half-duplex Ethernet operates in an exclusive collision domain.


    正确答案：AD
    解析：Explanation:
    A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame. while receiving a frame. That logic is called half-duplex logic.

    Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

    Incorrect Answers:
    B. Full duplex effectively doubles the throughput of half-duplex operation, because data can be both sent and received at the full 10/100 speed.

    C, E. In half duplex operation, the network is shared between all devices in the collision domain.

  • 第2题：

    b)

    main()

    {

    union{ /*定义一个联合*/

    int i;

    struct{ /*在联合中定义一个结构*/

    char first;

    char second;

    }half;

    }number;

    number.i=0x4241; /*联合成员赋值*/

    printf("%c%c\n", number.half.first,

    mumber.half.second);

    number.half.first='a'; /*联合中结构成员赋值

    */

    number.half.second='b';

    printf("%x\n", number.i);

    getch();

    }


    正确答案：

     

    AB (0x41 对应'A',是低位；Ox42 对应'B',
    是高位）6261 (number.i 和number.half 共用一块地址空
    间）

  • 第3题：

    计划的主要内容包括______计划必须清楚的确定和描述这些内容。

    A．What，Why，Who，Where，When，How many，How much

    B．What，Why，We，Where，When，How to，How much

    C．What，Why，We，Where，When，How，How much

    D．What，Why，Who，Where，When，How，How much


    确定组织发展目标制定全局战略;开发出一组广泛的相关计划;制定战略实施和资源分配方案

  • 第4题：

    YouaretestingacomponentthatserializestheMeetingclassinstancessothattheycanbesavedtothefilesystem.TheMeetingclasshasthefollowingdefinition：

    Thecomponentcontainsaprocedurewiththefollowingcodesegment.

    MeetingmyMeeting=newMeeting（"Goals"）；

    myMeeting.roomNumber=1100；

    string[]attendees=newstring[2]{"John"，"Mary"}；

    myMeeting.invitees=attendees；

    XmlSerializerxs=newXmlSerializer（typeof（Meeting））；

    StreamWriterwriter=newStreamWriter（@"C：\Meeting.xml"）；

    xs.Serialize（writer，myMeeting）；

    writer.Close（）；

    YouneedtoidentifytheXMLblockthatiswrittentotheC：\Meeting.xmlfileasaresultofrunningthisprocedure.WhichXMLblockrepresentsthecontentthatwillbewrittentotheC：\Meeting.xmlfile？（）


    参考答案：B

  • 第5题：

    What are the differences between full－duplex Ethernet and half－duplex Ethernet?()

    A. Half-duplex Ethernet operates in a shared collision domain.

    B. Full-duplex Ethernet has a lower effective throughput.

    C. Half-duplex Ethernet operates in a private collision domain.

    D. Full-duplex Ethernet allows two-way communication.

    E. Half-duplex Ethernet operates in a private broadcast domain.


    参考答案：A, D

  • 第6题：

    计划的主要内容包括______，计划必须清楚地确定和描述这些内容。

    A．What， Why， Who， Where， When， How many， How much

    B．What， Why， We， Where， When， How to， How much

    C．What， Why， We， Where， When， How， How much

    D．What， Why， Who， Where， When， How， How much


    ACD

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