单项选择题
A.0.5 B.0.4 C.0.3 D.0.2
A.0.305~0.375 B.0.345~0.396 C.0.205~0.240 D.0.245~0.284
A.0.2~0.3 B.0.3~0.4 C.0.4~0.5 D.0.3~0.5
A.65±5 B.60±5 C.55±5 D.50±5
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