同时选用大排气量压缩机的购置费用较高。

At the same time displacement compressor chooses big purchase cost is higher.

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布勒每月能从节省的140美元中留下50美元，剩下的支付给SunRun，后者将用其补贴太阳能系统购置费用和雇人安装及维护系统的开支。

Buller gets to keep $50 of the savings and pays the balance to SunRun, which uses it to cover the cost of buying the solar system and hiring a contractor to install and maintain it.

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在同样的备件保障率要求约束下，如果备件可修复，备件的储备量就可以进一步减少，备件尤其是昂贵备件的购置费用就可以大幅度降低。

If the part is repairable, the amount of the part can be further reduced and the purchase cost of the part is reduced greatly with the same restriction of supply rate.

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