clearances间隙clearancen.清除；清理；清仓甩卖；间隙；许可证；结关；通关clearance technique清除技术clearance of switch尖轨跟端槽宽clearance operation清拆行动clearance criterion评估准则clearance procedure断电clearance type seal间隙型密封clearance cavitation空隙气蚀clearance limitation净空限制clearance controller间隙控制器clearance of the die模具间隙