这样做有需要更多开关的缺点，因此就增加了单位 千乏设备总成本。
This procedure has the disadvantage of requiring more switches and thus increasing the total equipment cost per kilo-vary.
这样做有需要更多开关的缺点，因此就增加了单位 千乏设备总成本。
This procedure has the disadvantage of requiring more switches and thus increasing the total equipment cost per kilo-vary.
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