单项选择题
A.≥4mm B.≥5mm C.≥6mm D.≥7mm
A.≤3mm B.≤2mm C.≤1mm D.≤O.5mm
A.≤0.2mm B.≤0.3mm C.≤0.4mm D.≤0.5mm
A.35mm B.30mm C.25mm D.20mm
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