Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.<br>A:cold front<br>B:warm front<br>C:tropical front<br>D:occluded front

Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.
A:cold front
B:warm front
C:tropical front
D:occluded front

出自：海船船员证

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