单项选择题
Before reassembling any machinery, you should （）.
A.replace all bearings regardless of length of service
B.apply a heavy coat of oil to all mating surfaces
C.clean any corroded surfaces and file all burrs smooth
D.coat all parts with alemite grease
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相关考题
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单项选择题
Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?（）
A.Peak value
B.Root-mean-square value
C.Average value
D.Maximum value -
单项选择题
Fuses placed in series with a thermal trip-type circuit breaker are used for （）.
A.time-delay protection
B.short-circuit protection
C.short duration surge protection
D.sustained overload protection -
单项选择题
The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains （）.
A.a magnetic operating coil
B.normally open line contacts
C.thermal-overload protection
D.a momentary-contact start button
