单项选择题
A（）is created by a pressure gradient or slope in the water level.
A.gradient current
B.density current
C.swift current
D.torrent current
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相关考题
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单项选择题
（）is the most widespread type likely to be encountered at sea and is caused by relatively warm air being cooled by flowing over a cooler sea surface.
A.FRONTAL FOG
B.MIXING FOG
C.ADVECTION FOG
D.RADIATION FOG -
单项选择题
（）is a type of fog occurring close to the sea surface when the air is dry and cold-probably at least 9℃ below the sea surface temperature.
A.MIXING FOG
B.ADVECTION FOG
C.RADIATION FOG
D.ARCTIC SEA SMOKE -
单项选择题
（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.
A.FRONTAL FOG
B.MIXING FOG
C.ADVECTION FOG
D.RADIATION FOG
