更多"The underwater listening system was"的相关试题:
[单项选择]The underwater listening system was originally designed
A. to trace and locate enemy vessels
B. to monitor deep-sea volcanic eruptions
C. to study the movement of ocean currents
D. to replace the global radio communications network
[单项选择]The deep-sea listening system makes use of______ .
A. the sophisticated technology of focusing sounds under water
B. the capability of sound to travel at high speed
C. the unique property of layers of ocean water in transmitting sound
D. low-frequency sounds traveling across different layers of water