单项选择题

A.check it with a barometer on another vesselB.take rea……

For an accurate barometer check，you would（）.

A.check it with a barometer on another vessel
B.take readings from several barometers and average them
C.check it with the barometer at the ship chandlery
D.check it against radio or National Weather Service reports of the immediate vicinity

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单项选择题Fleet weather forecast messages are the expected conditions in（）.

A.a certain area
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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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A.Upwind
B.Downwind
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D.continuous fine mist-like rain

单项选择题Cirrus clouds are composed primarily of（）.

A.ice crystals
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C.snow crystals
D.nitrogen