单项选择题
A.≥1.2mm B.≥1.4mm C.≥1.6mm D.≥1.8mm
A.0.2～0.3mm B.0.3～0.5mm C.0.2～0.6mm D.0.6～1mm
A.≥4mm B.≥5mm C.≥6mm D.≥7mm
A.≤3mm B.≤2mm C.≤1mm D.≤O.5mm
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