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功率计在满标度的二分之一处的误差变化不应大于满标度的0,25%
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
功率计在满标度的二分之一处的误差变化不应大于满标度的:
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