A.振動監(jiān)測與診斷 B.聲波監(jiān)測與診斷 C.溫度監(jiān)測與診斷 D.螺栓松動
A.壓力控制閥 B.流量控制閥 C.方向控制閥 D.截止閥
A.30 B.40° C.50° D.60°