A.齒數(shù)z≤zmin B.齒數(shù)z≥zmin C.模數(shù)m≤mmin D.模數(shù)m≥mmin
A.15 B.17 C.18 D.20
A.普通車床 B.萬能銑床 C.滾齒機(jī) D.牛頭刨床