The passage is chiefly about（    ）

试卷相关题目

• 1I n our country, the voltage of the DC ultra-high voltage power network is（    ）

  A.DC±500kV

  B.DC±800kV and above

  C.DC±330kV

  D.DC±1000kV

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• 2What  is  the  meaning  or'uHV"、（    ）

  A.The high voltage

  B.The extra-voltage

  C.The rated standard voltage

  D.The ultra-high voltage

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• 3I n our country, the specifed rated standard voltages is（    ）

  A.the phase voltage effective value

  B.the phase voltage peak value

  C.the line voltage effective value

  D.the line voltage peak value

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• 4I n our country, what voltage dass's power network is called the highvoltage             networks、()

  A.35kV and above

  B.1000kV

  C.500kV

  D.110kV and 220kV

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• 5The function of transmission is to send（    ）

  A.the electric power

  B.the heat energy

  C.kinetic energy

  D.potential energy

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• 6T he underwater listening system was originally designed（    ）

  A.to replace the global radio communications network

  B.to study the movement of ocean currents

  C.to monitor deep-sea volcanic eruptions

  D.to trace and locate enemy vessels

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• 7The deep-sea listening system makes use of（    ）

  A.the capability of sound to travel at high speed

  B.the sophisticated technology of focusing sounds under water

  C.low-frequency sounds traveling across different layers of water

  D.the unique property of layers of ocean water in transmitting sound

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• 8It can be inferred from the passage that（    ）

  A.blue whales are no longer endangered with the use of the new listening system

  B.military technology has great potential in civilian use

  C.new radio devices should be developed for tracking the endangered blue whales

  D.opinions differ as to whether civilian scientists should be allowved to use military technology

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• 9Which of the following is true about the U.S 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  A.It has been replaced by a more advanced system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

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• 10The sun is the source of all of the following EXCEPT（    ）

  A.gasoline

  B.natural gas

  C.atomic power

  D.animal fat

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