單項(xiàng)選擇題The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each().

A.hour
B.day
C.week
D.month


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1.單項(xiàng)選擇題On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?()

A.Engine is hard to start
B.Engine misses
C.Surges at governed RPM
D.Coolant temperature is too low

2.單項(xiàng)選擇題The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()

A.regulating the level of corrosion inhibitor in the primary cooling system
B.the level of the freshwater expansion tank
C.varying the engine load to meet temperature requirements
D.the operation of the thermostatic valve