單項選擇題To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.
A.lantern rings
B.bearings
C.easing volutes
D.wearing rings
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1.單項選擇題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
2.單項選擇題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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On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
題型：單項選擇題
The output volume of a positive fixed displacement pump can be changed only by （）.
題型：單項選擇題
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題型：單項選擇題
The usual symptoms of cavitation in a centrifugal pump is （）.
題型：單項選擇題
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
題型：單項選擇題