问题
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The fire of electrical equipment is classified as fire.
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In an alternating current electrical system, a low system power factor is a direct sign of _____.
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Lightning is a ________ of electrical current fro
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Lightning is a ________ of electrical current from
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Please ______ from smoking until the airplane is airborne.[1997]A.refrainB.preventC.resist
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The amount of heat produced by this electrical apparatus is______at will by turning a smal
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