单项选择题

Especially in adverse weather，risk of collision with an offshore supply vessel increases when the vessel is moored to what side of the unit?（）.

A.Upwind
B.Downwind
C.Crosswind
D.Downcurrent

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单项选择题
Early indications of the approach of a hurricane may be all of the following EXCEPT（）.

A.short confused swells
B.gradually increasing white clouds (mare's tails)
C.pumping barometer
D.continuous fine mist-like rain
单项选择题
Cirrus clouds are composed primarily of（）.

A.ice crystals
B.water droplets
C.snow crystals
D.nitrogen
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