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History, 24.07.2019 05:30 cdubble04

During world war ii, the effectiveness of german u-boats and underwater mines was ended by the development of select one: a. acoustic countermeasures. b. sonar. c. centimetric radar. d. both sonar and centimetric radar. e. all these answers are correct.

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During world war ii, the effectiveness of german u-boats and underwater mines was ended by the devel...
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