多弹簧式机械密封 spring rotating mechanical seal: 弹簧旋转式机械密封-spring standing mechanical seal: 弹簧静止式机械密封-mechanical seal: 端面密封; 机械封口; 机械密封; 机械式轴封; 装备机械轴封seal spring: 密封弹簧mechanical spring: 机械弹簧下载手机词典可随时随地查词查翻译