The present invention also discloses the machining method and installing method of the hydropower dual-purpose composite pipe.

本发明还公开了上述水电两用复合管的加工方法和安装方法。

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Design purpose and principle of the lathe of supporting roller are mainly introduced in the paper. The cutting tool construction, installing method and power resource are also described.

主要介绍托辊加工机床设计目的及设计原理，陈述了刀具的结构与装夹方式、动力来源。

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Other ideas include drilling into the aquifer beneath the city and pumping cool water along the tunnels (a method already used to cool the Royal Festival Hall), or installing chillers in the trains that would freeze blocks of ice while the trains were above ground which would then keep them frosty on the underground sections.

ECONOMIST: London Underground