单项选择题X 纠错
A.lowest absolute humidity
B.lowest relative humidity
C.highest absolute humidity
D.highest relative humidity
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单项选择题
A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue
单项选择题
A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor
单项选择题
A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide
单项选择题
A.be clear
B.be blue
C.be light green
D.show bubbles
单项选择题
A.temperature in the space being cooled
B.liquid refrigerant pressure at the solenoid valve
C.pressure drop across the evaporator coils
D.refrigerant gas superheat at the coil outlet
单项选择题
A.remains the same
B.is reduced
C.is increased
D.is eliminated
单项选择题
A.corrosion on the gears
B.excessive gear speed
C.dirt in the oil
D.misalignment of the gears
单项选择题
A.maintain alignment when the ship’s hull is working in heavy seas
B.ensure engine vibrations correspond to the natural frequency of the hull
C.permit the engine to expand away from the driven equipment as the engine heats up and expands
D.maintain engine thrust bearing clearances
单项选择题
A.must churn the oil in the sump
B.is connected to the propeller shaft
C.is driven at the highest RPM
D.compensates for alignment variations between the engine and pinion gear
单项选择题
A.reduce load
B.check your exhaust
C.adjust cooling water temperature
D.increase lube oil flow