单项选择题

Air temperature varies with（）.

A.the altitude above sea level
B.the season of the year
C.the latitude or distance from the equator
D.All of the above

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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

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