单项选择题
A.0.002 B.0.002~0.005 C.0.02 D.0.02~0.05
A.6 B.8 C.10 D.11
A.0.4B.0.5C.0.6D.0.7
A.0.12 B.0.16 C.0.20 D.0.24
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