单项选择题
A.0.5mmB.1mmC.1.5mmD.2mm
A.2,0.5-0.8B.2,0.6-0.9C.3,0.5-0.8D.3,0.6-0.9
A.6hB.7hC.8hD.9h
A.30%B.40%C.50%D.60%
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