The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as（）
A、opposing operational drag
B、pressure distribution
C、differential
D、system purge
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A leaking diesel engine fuel injector will cause（）
A、prolonged maintenance intervals
B、improved atomization
C、greater fuel economy
D、incomplete combustion
The Company should ensure that the master is fully （） with the Companys SMS.
A、familiar
B、understand
C、conversation
D、confused
To prevent the spread of fire by conduction, you should （）.
A、cool the bulkheads around the fire
B、remove combustibles from direct exposure
C、close all openings to the area
D、shut off all electric power
（）, the motion would continue indefinitely once it had started.
A、Were there loss of energy by friction
B、Since there be loss of energy by friction
C、Were there no loss of energy by friction
D、Should be no loss of energy by friction
The accident resulted （） the motorman’s carelessness.
A、in
B、to
C、from
D、by
