单项选择题
A.clearing weather B.that a warm front has passed C.probable thunderstorm activity D.an approaching hurricane or typhoon
Cumulonimbus clouds are formed by（）.A.vertical air move...
单项选择题Cumulonimbus clouds are formed by（）.
A.vertical air movements B.heavy rainstorms C.horizontal air movements D.any movement of moist air
A（）is created by a pressure gradient or slope in the wa...
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
（）is the most widespread type likely to be encountered ...
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
