单项选择题
A.≤0.5mm B.≤1mm C.≤1.5mm D.≤2mm
A.≥5mm B.≥10mm C.≥15mm D.≥20mm
A.≤1mm B.≤2mm C.≤3mm D.≤4mm
A.1 B.2 C.3 D.4
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