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当前学科：工业生产用电
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《供电营业规则》第五十三条规定：在电力系统正常状况下，电网装机容量在300万千瓦及以上的，供电频率的允许偏差为（）。
A . A．±0.2赫兹
B . B．±0.5赫兹
C . C．±1.0赫兹
D . D．±0.1赫兹
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