1) control valve stem
控制阀杆
2) four stem control valve
四杆控制阀
3) stick control valve
斗杆控制阀
4) air valve control lever
气阀控制杆
5) lap and lead lever
滑阀控制杆
6) backhoe stick control valve
反铲斗杆控制阀
参考词条