单项选择题
A.0.05 B.0.04 C.0.03 D.0.02
A.0.03~0.05 B.0.08~0.10 C.0.10~0.12 D.0.12~0.20
A.0.05~0.10 B.0.10~0.20 C.0.20~0.30 D.0.30~0.50
A.0.05~0.10 B.0.10~0.175 C.0.175~0.250 D.0.25~0.40
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