单选题An occluded front is usually caused by a（）.Acold front becoming stationaryBwarm front becoming stationaryCcold front overtaking a warm frontDwarm front dissipating
单选题
An occluded front is usually caused by a（）.
A
cold front becoming stationary
B
warm front becoming stationary
C
cold front overtaking a warm front
D
warm front dissipating
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