单项选择题
A.0.8mm B.4.0mm C.5.6mm D.10mm
A.12.7×25.4mm B.12.7×152.4mm C.10.0×25.4mm D.15×25.4mm
A.50.8mm/min B.1.27mm/min C.12.7mm/min D.2.54mm/min
A.20mm B.30mm C.40mm D.50mm
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