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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单项选择题
Advection fog may be formed by cold air passing over a（）.
A.colder sea surface
B.warmer sea surface
C.dry coastal plains
D.high mountain or plateau -
单项选择题
A sea anchor is（）.
A.a heavy anchor with an extra long line used to anchor in deep water
B.a cone shaped bag used to slow down the wind drift effect
C.a pad eye to which the sea painter is made fast
D.made of wood if it is of an approved type -
单项选择题
A mercurial barometer at sea is subject to rapid variations in height (“pumping”) due to the pitch and roll of the vessel. To avoid this error，measurements of atmospheric pressure at sea are usually measured with a(n)（）.
A.syphon barometer
B.cistern barometer
C.aneroid barometer
D.fortin barometer
