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当功率因数在滞后1 ~0,5变化时
gen. the error of a wattmeter at half full-scale shall not vary by more than 0. 25% of full scale for Precision instruments when the power factor is varied between unity and 0. 5 lagging
当功率因数在滞后1 ~0,5变化时: 2 phrases in 1 subject
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