短语词组短语air extracting seal 抽气密封AIR SHAFT SEAL 压缩空气旋转接头intake air lines seal 进气管路密封Air -Seal 密封air -seal test 气密试验air curtain seal 气幕密封air cylinder seal 风洞密封件air r seal 气封air tight seal 气密;密封;气体密封圈 返回 air seal