单项选择题
A.≥1mm B.≥2mm C.≥3mm D.≥4mm
A.≥11mm B.≥16mm C.≥18mm D.≥21mm
A.≤25mm B.≤30mm C.≤35mm D.≤40mm
A.≤0.3mm B.≤0.4mm C.≤0.5mm D.≤06mm
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