单项选择题
A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.
A.occluded front
B.warm front
C.cold front
D.warm sector
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相关考题
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单项选择题
A hygrometer is a device used for determining（）.
A.the absolute temperature
B.atmospheric pressure
C.wind velocity
D.relative humidity -
单项选择题
A generally circular low pressure area is called a(n)（）.
A.cyclone
B.anticyclone
C.cold front
D.occluded front -
单项选择题
A frontal thunderstorm is caused by（）.
A.pronounced local heating
B.wind being pushed up a mountain
C.a warm air mass rising over a cold air mass
D.an increased lapse rate caused by advection of warm surface air
