单项选择题
A.5℃~10℃ B.10℃~15℃ C.15℃~20℃
A.10% B.15% C.20%
A.1~1.5 B.1.5~2.0 C.2.0~2.5
A.3~5层,2~3m B.2~4层,3~5m C.1~4层,1~2m
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