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1 若游標卡尺本尺1格1mm,取其39格在游尺上分成20格,則本尺2格與游尺1格相差
A 0.02mm
B 0.05mm
C 0.1mm
D 0.5mm
游尺取本尺39格等分成20格,每格=1 × 39 × 1203920 =1.95mm,即本尺2格與游尺1格相差1 × 2-1.95=0.05mm