單項選擇題

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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單項選擇題

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

單項選擇題

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

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Before reassembling any machinery, you should （）.

你可能感興趣的試題

Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured?（）

Fuses placed in series with a thermal trip-type circuit breaker are used for （）.