... mains frequency 电网频率 mains regulator 电源调节器 mains switch 电源开关 ...
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mains voltage regulator 电源电压调节器
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Ofgem said that the increase in allowances compared with their July proposal was because the regulator had agreed to let gas network firms charge more for the cost of replacing gas mains.
BBC: Ofgem permits ?12 energy bills rise for grid upgrade
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