单项选择题
A.＞0.2% B.＞0.3% C.＞0.4% D.＞0.5%
A.≤2mm B.≤3mm C.≤4mm D.≤5mm
A.≤0.2mm B.≤0.3mm C.≤0.4mm D.≤0.5mm
A.≤1/2 B.≤1/3 C.≤1/4 D.≤1/5
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