In this article, a simple and reliable test scheme was proposed, in which the parts in the exchanger were used to replaced the tools, Therefore, the cost of the fabrication can be decreased.

为降低加工成本，提出了行之有效、简单可靠的试压方案，全部用利用设备的零部件，实现浮头式换热群管头的试压。

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The cover is one of the most extensively used parts in machine products. Whether its machining process appropriate or not has great influence upon parts?quality and producing cost.

端盖是机械产品中应用最广泛的零件之一，其加工工艺是否合理，对零件的质量、生产成本影响很大。

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According to Makerbot, the most well known in a crop of companies developing low cost 3D printers, the technology is being used by NASA engineers to develop parts for models, including for the Mars Rover, Curiosity.

FORBES: How 3D Printing is now helping NASA get to space