自动开闭门 automatic opener

展开闭门内部聆讯 held a closed-door internal hearing ; held a closed-door

电动式门开闭装置 automatic electric door opener

气门开闭循环期 valve cycle

活门开闭机构 [机] discharge gate operating mechanism

开始关门关闭速度 Start Close Speed

开始关门关闭距离 Start Close Dist