单项选择题
Fetch is the（）.
A.distance a wave travels between formation and decay
B.stretch of water over which a wave-forming wind blows
C.time in seconds required for two crests to pass a given point
D.measurement of a wave's steepness
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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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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)
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单项选择题
Cirrus clouds are composed primarily of（）.
A.ice crystals
B.water droplets
C.snow crystals
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