Which of the following is true about the U.S Navy underwater listening network、（    ）

试卷相关题目

• 1It 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

  开始考试点击查看答案
• 2The 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

  开始考试点击查看答案
• 3T 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

  开始考试点击查看答案
• 4The passage is chiefly about（    ）

  A.the civilian use of a military detection system

  B.the exposure of a U.S.Navy top-secret weapon

  C.an effort to protect an endangered marine species

  D.a new way to look into the behavior of blue whales

  开始考试点击查看答案
• 5I 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

  开始考试点击查看答案
• 6The sun is the source of all of the following EXCEPT（    ）

  A.gasoline

  B.natural gas

  C.atomic power

  D.animal fat

  开始考试点击查看答案