单项选择题

In polar regions you should NOT expect to see（）.

A.mirage effects
B.sea smoke
C.extensive snowfall
D.false horizons

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单项选择题

In order to retrieve an inflatable liferaft and place it on deck，you should heave on the （）.

A.lifelines
B.righting strap
C.sea anchor
D.towing bridle

单项选择题

In many areas “atoll” clouds (clouds of vertical development) are produced over small islands. These are the result of（）.

A.rising air currents produced by the warm islands
B.warm air from the sea rising over higher land areas
C.cool land air mixing with warm sea air
D.descending air over the islands

单项选择题

In good weather，you should deploy the sea anchor from the liferaft to（）.

A.keep the liferaft from capsizing
B.navigate against the current
C.keep personnel from getting seasick
D.stay in the general location