A.deteriorates
B.increases
C.are fouled
D.becomes better
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A.varying the D-Cexciter voltage
B.varying the reluctance of the air gap
C.regulating the speed of prime mover
D.shorting out part of the armature windings
A.short circuit
B.speed up
C.slow down
D.hunting
A.live
B.dead
C.excited
D.on line
A.Feed back
B.Negative feed back
C.Close loop
D.Open loop
A.The shaft
B.The mechanical
C.The electric
D.The indicated
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
The cetane rating of diesel fuel is an indication of the （）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.