单项选择题
A.0.1B.0.1mmC.<0.2mmD.<0.2
A.0.25~0.5mmB.0.15~0.3mmC.0.1~0.2mmD.0.3~0.6mm
A.BPNB.mmC.cmD.km
A.0.05B.0.1C.0.2D.1
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