Cirrus clouds followed by cirrostratus then altostratus，stratus，and occasionally nimbostratus indicate the approach of a(n)（）.
- Acold front
- Bwarm front
- Ctropical front
- Doccluded front
问题
Cirrus clouds followed by cirrostratus
参考解析：
分类：航海气象基本知识题库
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