单项选择题
A.70% B.75% C.90% D.95%
A.1%-2% B.2%-3% C.3%-4% D.4%-5%
A.1:100 B.1:150 C.1:200 D.1:250
A.4-8℃ B.低于12℃ C.低于17℃ D.20℃
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