您要查找的是不是：
- 双通单向阀double check valve
- 双进口double feed inlet
- 双pair
- 一例液压泵进口液控单向阀装错引发的故障A Trouble Caused by Misplaced Inlet Pilot-operated Check Valve of Hydraulic Pump
- 进口import
- 双进口泵double-entry pump
- 十字单向阀spider singe check valve
- 双击double-click
- 阀valve
- 双进口风机double inlet fan
- 电磁阀solenoid pilot actuated valve
- 双语diglossia
- 球瓣单向阀ball clack valve
- 一双pair
- 进口的inward
- 闸阀gate(brake; shutoff; shut-off) valve
- 双赢Win-win
- 球阀ball plug
- 进口关税import duty
- 截止阀disconnecting valve
