单项选择题
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
Especially in adverse weather，risk of collision with an...
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
Early indications of the approach of a hurricane may be...
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
Cirrus clouds are composed primarily of（）.A.ice crystal...
单项选择题Cirrus clouds are composed primarily of（）.
A.ice crystals B.water droplets C.snow crystals D.nitrogen
