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The corona discharge, consisting of a series of small lightning-type discharges, has the advantage to be easily formed at by applying a high voltage over an electrode pair.
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can be used to clean up the fabric surface after the primary fibrillation of a peach skin treatment and prior to a secondary fibrillation process which imparts interesting fabric aesthetics.
,R=15欧，L=0.2H,C=500uF,则该电路的功率因数为( )。
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