单项选择题
A cloud sequence of cirrus，cirrostratus，and altostratus clouds followed by rain usually signifies the approach of a(n)（）.
A.occluded front
B.stationary front
C.warm front
D.cold front
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相关考题
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单项选择题
A cloud of marked vertical development (often anvil-shaped) would be classified as（）.
A.cirrus
B.cirrocumulus
C.altocumulus
D.cumulonimbus -
单项选择题
A boundary between two air masses is a(n)（）.
A.lapse rate
B.isobar
C.front
D.continent -
单项选择题
（）causing strong winds and rough sea north west Bay of Biscay.
A.Strong low pressure
B.Strong high pressure
C.Steep pressure gradient
D.Steep gradient pressure
