单项选择题
A.1%/5% B.5%/10% C.10%/15% D.15%/20%
A.密封环起密封与传热作用 B.搭口间隙指自由状态下的开口间隙 C.密封环会产生泵油作用 D.矩形断面的密封环应用最广
A.压缩环与承磨环 B.压缩环与刮油环 C.刮油环与承磨环 D.压缩环、刮油环、承磨环