单项选择题
A.±0.01mmB.±0.02mmC.±0.03mmD.±0.04mm
A.1hB.2hC.3hD.5h
A.1dB.2dC.3dD.5d
A.0.4~0.6m/sB.0.4~0.8m/sC.0.5~0.6m/sD.0.5~0.8m/s
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