单项选择题

The external flotation bladder of an immersion suit should be inflated（）.

A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
D.upon entry into the water

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The dumping of refuse in a lock is permitted（）.

A.when approved by the lockmaster
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The disadvantage of using a heaving line to pass a towline is that（）.

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