clearancen.清除；清理；清仓甩卖；间隙；许可证；结关；通关clearance outwards结关出口clearance standard限界标准clearance bar lever检查铁条握柄clearances junction间隙连接clearance diatances电气间隙clearance mechanism清除机制clearance diametral[化] 径向间隙clearance of tunnel隧道限界clearance treatment清除治疗clearance seal type间隙密封型