<th id="fjdcw"></th><strike id="fjdcw"></strike>

單項(xiàng)選擇題

Shaft sealing in a centrifugal pump can be effected by （）.

A.the mechanical seal
B.packed stuffing boxes
C.either A or B
D.neither A nor B

你可能感興趣的試題

單項(xiàng)選擇題

As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （）
(1)the rotor
(2)the pump shaft
(3)the external surface of the housing

A.(1) only
B.(2) only
C.(1) and (2)
D.(1),(2)and(3)

單項(xiàng)選擇題

As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.

A.circular
B.elliptical
C.rectangular
D.hexagon

感谢您访问我们的网站，您可能还对以下资源感兴趣：

精品伊人久久大香线蕉男人的天堂

国产午夜精品福利久久无遮挡h纯内动漫在线观看国产偷窥盗摄网站国产亚洲精品无码颜射老妇

<noscript id="bywhi"><sup id="bywhi"></sup></noscript>