单项选择题
A.1mm±0.5mmB.2mm±0.5mmC.3mm±0.5mmD.4mm±0.5mm
A.≤0.3B.≤0.5C.≤0.7
A.≤0.2mmB.≤0.3mmC.≤0.5mmD.≤0.7mm
A.1mmB.2mmC.3mm
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