单项选择题
A light，feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form，on objects whose temperatures are below freezing，is called（）.
A.dew
B.frost
C.glaze
D.snow
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A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.
A.high density will be on the left in the Northern Hemisphere
B.high density will be on the right in the Southern Hemisphere
C.low density will be on the left in the Northern Hemisphere
D.low density will be on the left in the Southern Hemisphere -
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A current perpendicular to a vessel’s track has the greatest effect on the vessel’s course made good（）.
A.at high vessel speeds
B.at low vessel speeds
C.in shallow water
D.in deep water -
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A condition where two currents meet at the downstream end of a middle bar can be determined by a（）.
A.small whirlpool
B.smooth patch of water
C.V-shaped ripple with the point of the V pointing downstream
D.V-shaped ripple with the point of the V pointing upstream
