这都是一些有用的方法 » These are some useful methods 实现铅酸蓄电池免维护性能 » To achieve maintenance-free lead-acid battery performance ..
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They are callable objects that also have some methods of their own:.reduce is probably the most useful of these.
它们还可以是可调用的对象，具有自己的方法：其中. reduce可能是最为有用的一个。
This paper states some methods to improve the EER of the conditioner with the refrigerant of R407C, these methods are proved to be useful and efficient by the experiments.
本文阐述了一些提高新工质r 407c机型能效比的实用方法，这些方法通过实验验证，证明了其实用性和有效性。
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