单项选择题
A.2% B.1.5% C.1% D.0.5%
A.2.5% B.2% C.1.5% D.0.5%
A.〉2m3/t B.〉5m3/t C.〉8m3/t D.〉10m3/t
A.10 B.5 C.15 D.20
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