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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(驾驶专业) > 航海英语 > 航海气象 > 海上天气现象

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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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

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