The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to

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all of the above

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lubricate the contacts

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insulate the contacts from switch body

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extinguish the arc

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none of the above

1.	The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
A.	lubricate the contacts
B.	insulate the contacts from switch body
C.	extinguish the arc
D.	all of the above
E.	none of the above
Answer» D. all of the above

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