rotary valve stem gasket的意思|示意

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旋转阀杆垫

旋转阀杆垫 ... 旋转放电器：rotary discharger 旋转阀杆垫：rotary valve stem gasket 旋转阀反射炉：rotator ...

扭转阀杆垫 ... rotary valve spring 扭转阀弹簧 rotary valve stem gasket 扭转阀杆垫 rotary valve 回转阀 ...