单项选择题
A.1~2B.1~3C.1~1.5D.1~2.5
A.3~5B.5~8C.5~10D.8~10
A.15、C15B.20、C15C.20、C20D.20、C25
A.φ0.5~0.6mB.φ0.6~0.7mC.φ0.8~0.9mD.φ1.0~1.5m
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