acid-resistant stoneware valve 耐酸陶瓷阀门 acorn valve 橡实形电子管 actuated valve 控制阀 adjusting valve 调整阀 adjustment of valve clearance 调整阀隙 admission valve 进气阀; 进汽阀; 进入阀 ageing of valve 电子管的老化 air admission valve 进空气阀; 真空破坏阀 air back valve 空气止回阀 air ble...