Symmetrical diynes were synthesized by ligand-free copper-catalyzed homocoupling reaction.

通过无配体的铜催化均偶联反应合成对称二炔。

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Effects of re on technological processing and product properties of oxygen free copper rod in up-drawing casting were studied.

研究了微量稀土对上引法无氧铜杆生产工艺及产品性能的影响。

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Technological method of control oxygen content for oxygen-free copper sheets in production process is introduced. There is reference value.

介绍了电真空行业用无氧铜板的生产过程中控制氧含量的工艺方法，以供同类厂家参考。

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They also come with a new specially designed carrying case that features cable management, as well as OFC (oxygen free copper) cables for enhanced sonic performance.

ENGADGET: Denon outs 2009 line of Blu-ray players, AV receivers and headphones