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 E. map the o

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 o

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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
Echo-sounding devices were early used to______.
选项
答案E
解析 段落句子补充信息类的题目需要回归到该问题所出现的位置，根据上下文进行寻找、进行提炼或转换近义的词句。以下同此。根据第二段的首句可以找出答案：早期的回声设备主要用来测量海床的深度。
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