A.静密封B.动密封C.径向密封D.旋转动密封
A.1% B.3% C.5% D.10%
A.不偏转 B.偏转较小 C.偏转较大 D.无变化
A.14 B.16 C.18 D.20
A.结构钢 B.碳素钢 C.工具钢 D.40号钢