單項(xiàng)選擇題What is the function of wearing rings found on some centrifugal pumps? ()

A.Absorb erosion of high velocity discharge stream
B.Seal pump shaft against entry of air
C.Isolate the outlet side from the inlet side
D.Dampen the turbulent discharge flow


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1.單項(xiàng)選擇題What is the best indication of the loading of a diesel engine?()

A.Oil temperature
B.Manifold pressure
C.Exhaust gas temperature
D.Fuel consumption

2.單項(xiàng)選擇題What is NOT a responsibility of the tankerman in charge of loading an unmanned tank barge? ()

A.Enforcement of smoking restrictions
B.Restricting vessels from coming alongside the barge
C.Insuring that a combustible gas indicator is aboard
D.Protecting cargo hose with chafing gear