单项选择题

The cylinder covers are secured by eight elastic holding down arranged in four pairs（）

A.nuts
B.screws
C.studs
D.flanges

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单项选择题

With No~1 and No~2 alternators running in parallel and the KW loads equally shared, one alternator is drawing much higher current than the other.What does this indicate?（）

A.The alternators are not generating the same voltages and should be adjusted on automatic voltage regulator rheostats
B.Alternator frequencies are different and should be adjusted on the governor speed controllers
C.Alternators are out of phase and should be tripped and paralleled again
D.One alternator has lost one of its phases

单项选择题

Operational amplifiers, used primarily in analog circuits, are characterized by（）

A.high input impedance, high gain and low output impedance
B.high input impedance, high gain and high output impedance
C.low input impedance, low gain and high output impedance
D.low input impedance, high gain and low output impedance

单项选择题

CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce（）

A.methyl chloride
B.ammonia
C.hydrofluoric acid
D.ozone

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