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單項(xiàng)選擇題

Steady precipitation is typical of（）.

A.coming cold weather conditions
B.a warm front weather condition
C.high pressure conditions
D.scattered cumulus clouds

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單項(xiàng)選擇題

Snow has obliterated surface features and the sky is covered with uniform，altostratus clouds. There are no shadows and the horizon has disappeared. What is this condition called? （）

A.Ice blink
B.Whiteout
C.Water sky
D.Aurora reflection

單項(xiàng)選擇題

Relative humidity is the percentage of water vapor that is in the air as compared to the maximum amount it can hold at（）.

A.a specific barometric pressure
B.a specific temperature
C.a specific wind speed
D.any time

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