单项选择题X 纠错
A.0.2mm B.0.3mm C.0.25mm
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单项选择题
A.0.2mm B.0.3mm C.0.25mm D.不允许
A.5∶1 B.3∶1 C.2∶1 D.1∶1
A.2/3~3/4 B.1/2~2/3 C.1/3~3/8
A. 2/3~3/4 B.1/2~2/3 C.1/3~3/8
A.10º B.20º C.30º
A.150~250mm B.250~400mm C.0.9~1.5m
A.10min B.20min C.30min D.40min
A.50~100mm B.100~150mm C.150~250mm D.250~400mm
A.50~100mm B.100~150mm C.150~250mm
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