单项选择题
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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相关考题
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单项选择题
If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.
A.worn gland sealing shaft
B.worn wearing rings
C.a bent shaft
D.reversed pump coupling -
单项选择题
Which of the devices listed is common to all types of pumps?（）
A.A power end and fluid end
B.A propeller and educator
C.A volute and impeller
D.A turbine and piston -
单项选择题
A centrifugal pump may fail to deliver water when first started if the （）.
A.water seal pipe is plugged
B.pump is not primed
C.seal ring is improperly located
D.impeller is flooded
