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

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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利量海床的深度。
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