单选题Each time the distance from the speaker is doubled， volume decreases by（）.A 3dBB 6dBC 12dBD 24dB

题目
单选题
Each time the distance from the speaker is doubled， volume decreases by（）.
A

3dB

B

6dB

C

12dB

D

24dB

相似考题

1.Communication through writing emancipates man from the constraints imposed by the face－to－face distance and the () of time.A、spontaneityB、responsibilityC、complexityD、confusion

2.平底孔距离一定,直径增加一倍,其回波升高()。A、0dBB、6dBC、12dBD、18 dB

3.The distance between any two meridians measured along a parallel of latitude ______.A.increases in north latitude and decreases in south latitudeB.decreases as DLO increasesC.increases with increased latitudeD.decreases with increased latitude

4.Communication through writing emancipates man from the constraints imposed by the face-to-face___and the spontaneity of time.A. confusionB. responsibilityC. complexityD. distance

更多“单选题Each time the distance from the speaker is doubled， volume decreases by（）.A 3dBB 6dBC 12dBD 24dB”相关问题

  • 第1题：

    In ship construction, keel scantlings should be the greatest ______.

    A.at each frame

    B.amidships

    C.one-third the distance from the bow

    D.one-third the distance from the stern


    正确答案：B
    在建造船舶时，龙骨的尺寸在船中是最大的。

  • 第2题：

    平底孔距离一定，直径增加一倍，其回波升高（）。

    • A、0dB
    • B、6dB
    • C、12dB
    • D、18dB

    正确答案:C

  • 第3题：

    在远场区，同声程横孔，直径增大1倍，则声压增大（）。

    • A、3dB
    • B、6dB
    • C、9dB
    • D、12dB

    正确答案:C

  • 第4题：

    目前标准POI插损在（）左右。

    • A、3dB
    • B、6dB
    • C、7dB
    • D、10dB

    正确答案:B

  • 第5题：

    Which of the following is the primary purpose of impedance matched volume control？（）

    • A、Maintains proper speaker phase
    • B、Protects the amplifier from damage
    • C、Protects the digital systems from damage
    • D、Amplifies the speaker signal

    正确答案:B

  • 第6题：

    在线性PCM编码中，编码位数增加1位则量化信噪比增加（）

    • A、3db
    • B、6db
    • C、12db
    • D、24d6

    正确答案:B

  • 第7题：

    一个高频桥路的衰耗值是（）

    • A、3dB
    • B、6dB
    • C、7dB

    正确答案:C

  • 第8题：

    单选题
    The radar control that reduces weak echoes out to a limited distance from the ship is the（）.
    A

    sensitivity time control (sea-clutter control)

    B

    receiver gain control

    C

    brilliance control

    D

    fast time constant (differentiator)


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following is the primary purpose of impedance matched volume control？（）
    A

    Maintains proper speaker phase

    B

    Protects the amplifier from damage

    C

    Protects the digital systems from damage

    D

    Amplifies the speaker signal


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    —Hurry up, or we’ll be late.—Take your time. it’s just ______ short distance from here to ______ cinema.
    A

    /; the

    B

    the; a

    C

    a; the

    D

    /; a


    正确答案： C
    解析：
    本题考查冠词的用法。句意：——快点，否则我们要迟到了。——不急，从这里到电影院只是一小段距离。a short distance一小段距离；cinema前用the，表特指，故答案为C。

  • 第11题：

    单选题
    Which of the following is the correct signal flow for an analog multi-room audio system？（）
    A

    Source，Volume Control，Speaker，Amp

    B

    Source，Amp，Volume Control，Speaker

    C

    Amp，Source，Volume Control，Speaker

    D

    Speaker，Amp，Volume Control，Source


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    In ship construction，keel scantlings should be the greatest（）.
    A

    at each frame

    B

    amidships

    C

    one-third the distance from the bow

    D

    one-third the distance from the stern


    正确答案： D
    解析： 暂无解析

  • 第13题：

    Take your time-it’just__________short distance from here torestaurant．

    A.不填；the
    B.a；the
    C.the；a
    D.不填：a

    答案：B
    解析：
    第一空表示泛指，a short distance意为“一段短距离”；第二空表示特指，指说话者双方心中所指的饭店。故选B项。

  • 第14题：

    Each time the distance from the speaker is doubled， volume decreases by（）.

    • A、3dB
    • B、6dB
    • C、12dB
    • D、24dB

    正确答案:B

  • 第15题：

    8阵元智能天线的理论赋形增益为（）

    • A、3dB
    • B、6dB
    • C、8dB
    • D、9dB

    正确答案:D

  • 第16题：

    Which of the following is the correct signal flow for an analog multi-room audio system？（）

    • A、Source，Volume Control，Speaker，Amp
    • B、Source，Amp，Volume Control，Speaker
    • C、Amp，Source，Volume Control，Speaker
    • D、Speaker，Amp，Volume Control，Source

    正确答案:B

  • 第17题：

    航向设备对工业、科学和医疗设备干扰的防护率是（）。

    • A、3db
    • B、6db
    • C、14db
    • D、17db

    正确答案:C

  • 第18题：

    在线性PCM编码中，编码位数增加1位则量化信噪比增加（）。

    • A、3db
    • B、6db
    • C、12db
    • D、24db

    正确答案:B

  • 第19题：

    单选题
    The distance that a vessel travels from the time that the order to put engines full astern until the vessel is dead in the water is known as（）.
    A

    advance

    B

    head reach

    C

    surge

    D

    transfer


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    A

    It will maintain a close relationship with Europe.

    B

    It will support the idea of a central European government.

    C

    It will keep a distance from Europe.

    D

    They will support each other.


    正确答案： B
    解析：
    在谈到与欧洲的关系时，Mrs. Faulkes提到we will maintain close links with Europe in the future。所以她认为未来英国仍会与欧洲其他国家保持亲密关系。
    【录音原文】
    M: In our radio car we have Geraldine Faulkes who is on the campaign trail. Now, Mrs. Faulkes, it’s only three weeks till the general election. How’s the campaign going?
    W: Thank you, John. I’m fully confident that the Conservative Party will win this general election and that the people of this country will welcome five more years of good Conservative Government. Our economy is growing stronger and now is the right time for income tax cuts.
    M: But you said you would lower taxes five years ago, but you didn’t, did you?
    W: Our economic policies over the last five years have given us one of the strongest economies in Europe with some of the lowest rates. We said that we were going to lower interest rates at the last election and we have delivered our promise.
    M: But I don’t think low interest rates are the same as lowering taxes. Why should we believe you on your promise to lower taxes this time?
    W: The economy of the country is now very healthy, and now is the time.
    M: Five years ago you said you were going to spend more money on healthcare, and you didn’t. Now we have fewer hospitals and waiting lists are enormous. Hospitals are also understaffed.
    W: In the last five years we have spent more on the healthcare system than the Labour government spent in their last 10 years.
    M: But the Labour Party was in power over 12 years ago and with inflation and the higher cost of living you can’t really compare spending 12 years ago and today, can you? Then what would a new Conservative government do to tackle unemployment?
    W: Unemployment has been falling steadily over the last five years thanks to our training schemes.
    M: But those schemes just keep young people out of the unemployment statistics for a few months. Very few of them get jobs in the end. In fact, all you did was to play with the statistics to make it look as if unemployment was falling. Well, what about more action on poverty?
    W: By reducing government handouts we have encouraged people to find themselves jobs. We believe in making people independent. There are jobs if they look hard enough.
    M: And what about your party’s attitude to Europe? There’s been a lot of argument in the party recently about whether we should have closer links with Europe.
    W: There’re no divisions within the Conservative Party. We’re united in our belief that we will maintain close links with Europe in the future. But a close relationship with Europe doesn’t mean that we will hand over government of this country to a central European government.
    M: We’ve run out of time. Thank you very much, Mrs. Faulkes.
    W: Thank you.
    Questions 1 to 5 are based on the conversation.
    Q1. How does Mrs. Faulkes respond to John’s query on the government’s not lowering taxes five years ago?
    Q2. What does John say about Britain’s healthcare?
    Q3. What does John think of the Conservative government’s training schemes in the last five years?
    Q4. What is the solution to poverty according to Mrs. Faulkes?
    Q5. What kind of relationship does Mrs. Faulkes think Britain will maintain with Europe?

  • 第21题：

    单选题
    The characteristics of good distance learning programs are the following EXCEPT _____.
    A

    students don’t have to travel away from home to take a test

    B

    the content of distance learning program is the same as that of the full time program in colleges and universities

    C

    the good distance learning programs include courses that are not taught in average universities

    D

    the relationship between students and professors are one-to-one


    正确答案： D
    解析：
    文章的第三段说明好的远程教育的几个特点。首先，学员们用不着到学校参加考试；其次，远程教育的课程设置要与全日制大学的课程设置相一致。参加远程教育的学生与教授的关系是一对一的。因此选C。

  • 第22题：

    单选题
    Each time the distance from the speaker is doubled， volume decreases by（）.
    A

    3dB

    B

    6dB

    C

    12dB

    D

    24dB


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    （）we stand away from the church bell, it takes time for the sound waves to each us.
    A

    If

    B

    Whenever

    C

    Because

    D

    Where


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    Which of the following best describes the thermodynamic effect on the pressure and volume relationship with regards to saturated gases?（）
    A

    As pressure decreases, volume increases

    B

    As volume increases, pressure increases

    C

    As volume decreases, pressure decreases

    D

    As pressure increases, volume increases


    正确答案： A
    解析： 暂无解析

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