问题
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In an alternating current electrical system, a low system power factor is a direct sign of _____.
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The two most effective generating forces of surface ocean currents are ().A.temperature an
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Of these alternatives, I prefer the former.(英译中)
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The frequency of the alternating current generated by a synchronous generator is governed
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AC and DC generators are similar in that they _____.A.both generate alternating voltagesB.
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We can evaluate the alternatives for a solution b