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【多选题】
电压是衡量电能质量的主要指标之一，对于电压质量说法正确的是（）。A.
用户受电的端电压偏移不得超过额定电压±5%
B.
波形为正弦波
C.
三相要对称
D.
波形中所含任一高次谐波的瞬时值应不低于同相基波电压瞬时值的5%
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