单项选择题
A.正常状态 B.注意状态 C.异常状态 D.严重状态
A.1/500 B.1/750 C.1/1000 D.1/150
A.70% B.80% C.90% D.100%
A.100~200mm B.100~300mm C.200~300mm D.300~400mm
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