你可能感興趣的試題

單項(xiàng)選擇題

If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings

單項(xiàng)選擇題

Distilled water from an evaporator may be discharged into a potable water tank （）.

A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve

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To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.

你可能感興趣的試題

If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

Distilled water from an evaporator may be discharged into a potable water tank （）.