单项选择题

After a liferaft is launched，the operating cord（）.

A.serves as a sea painter
B.detaches automatically
C.is used to rig the boarding ladder
D.is cut immediately as it is of no further use

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Advection fog may be formed by cold air passing over a（）.

A.colder sea surface
B.warmer sea surface
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D.high mountain or plateau

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A sea anchor is（）.

A.a heavy anchor with an extra long line used to anchor in deep water
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C.a pad eye to which the sea painter is made fast
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D.fortin barometer