单项选择题
A.60%～65% B.60%～70% C.65%～75% D.70%～80%
A.65.4 B.54.5 C.76.3 D.81.8
A.0.1~1kg/m3 B.0.15~1.5kg/m3 C.0.2~2kg/m3 D.0.25~2.5kg/m3
A.1.5% B.2.4% C.3.4% D.4.5%
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