It can be roughly estimated that an average of 300 to apply to a house.

它可以粗略估计，平均为300适用于一所房子。

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The range of the number of switches to be installed is roughly estimated.

根据建设费用确定拟增建开关的数量范围；

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The range of the number of switches to be installed is roughly estimated.

根据建设费用确定拟增建开关的数量范围；

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