单项选择题
A.φ12mm B.φ1.0mm C.φ0.8mm D.φ05mm
A.φ1.0mm B.φ12mm C.φ1.8mm D.φ2.5mm
A.φ1.1mm B.φ1.2mm C.φ1.6mm D.φ1.8mm
A.φ0.5mm B.φ0.6mm C.φ0.8mm D.φ1.0mm
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