ЭИ69堆焊排气门
69 pad welded exhaust valve
大气排气
atmospheric exhaust
atmospheric steam exhaust
电子设备冷却气排气口
electronic equipment cooling air exhaust port
废气排气系统
exhaust emission suction system
缸盖排气门
cylinder head exhaust valve
进排气门
Intake and Exhaust Valves
Inlet and Exhaust Gateway
进排气门坐圈
inlet’s and exhaust outlet’s seat ring