The flash point of a liquid refers to the temperature ______.
A. at which a liquid will give off inflammable（易燃的） vapors
B. at which a liquid will burn steadily
C. at which a liquid will explode
D. that a liquid must reach before it will flow readily
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A circuit breaker differs from a fuse in that a circuit breaker ______.
A. melts and must be replaced
B. is enclosed in a tube of insulating material with metal ferrules(环) at each end
C. gives no visual indication of having opened the circuit
D. trips to break the circuit and may be reset
The load sharing characteristics of two diesel generators operating in parallel are mostly
A. load limit settings
B. idle speed settings
C. speed limit settings
D. speed droop settings
As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will ______.
A. increase
B. decrease
C. remain unchanged
D. be greatest at dew point
If both the ‘high level’and ‘low level’ alarms come on for the same address of a centralized（集中的） control console, the most likely problem is a/an ______.
A. sensor failure
B. failed alarm
C. low level
D. extremely high level
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