Fleet weather forecast messages are the expected conditions in（）.

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

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

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

单项选择题An aneroid barometer reading should be corrected for differences in（）.

A.elevation
B.temperature
C.wind speed
D.latitude