2. 自考
  3. A. detect nearby objects B. determine the depth of the ocean water C. decide how fast you drive D. in need of radar

A. detect nearby objects B. determine the depth of the ocean water C. decide how fast you drive D. in need of radar

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问题     A. detect nearby objects
    B. determine the depth of the ocean water
    C. decide how fast you drive
    D. in need of radar
    E. map the ocean floor
    F. observe water flow     
Ultrasonic devices were used to________.
选项
答案B
解析 从第三段“Sounds or ultrasonic (超声的) sounds make good tools for determining how deep the water is under ships. ”可以看出，超声波是测量船下水深的一种有用工具。
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