单项选择题
A.φ1.1mm B.φ1.2mm C.φ1.6mm D.φ1.8mm
A.φ0.5mm B.φ0.6mm C.φ0.8mm D.φ1.0mm
A.6mm B.8mm C.20mm D.15mm
A.1mm B.2mm C.3mm D.4mm
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