单项选择题
A.45mm B.50mm C.55mm D.60mm
A.≥22mm B.≥20mm C.≥18mm D.≥16mm
A.≤8mm B.≤7mm C.≤6mm D.≤5mm
A.≤6mm B.≤5mm C.≤4mm D.≤3mm
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