单项选择题
A.410mm±5mmB.410mm±1mmC.126mm±5mmD.126mm±1mm
A.BPN20=BPNT -△BPNB.BPN20=BPNT+△BPNC.BPN20=BPNT×△BPND.BPN20=BPNT+2△BPN
A.0.15-0.2mnB.0.1-0.15mmC.0.1-0.3mmD.0.15-0.3mm
A.1mB.2mC.1.5mD.2.5m
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