问题描述：
[单选]
Most covered lifeboats will right themselves after capsizing if the（）．
A．passengers are strapped to their seats
B．fuel tanks are not less than half full
C．sea anchor is deployed to windward
D．lower ballast tanks are filled with water
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答案解析：无
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上一篇：Stretchers are fitted in lifeboats to provide a（）．
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