单项选择题
A.3 B.4 C.5 D.6
A.6 B.5 C.8 D.10
A.24；3；1 B.16；4；1 C.24；4；1 D.16；4；3
A.2%；0.5% B.0.5%；2% C.0.2%；0.5% D.0.5%；0.2%
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