根据断口的宏、微观形貌，认为油管焊接后未及时消除焊接应力，产生了淬硬裂纹；
The macro and micro analysis of fracture indicates that it produces fracture because it doesn′t avoid welding stress in time.
周四，力宏在北京举办新闻发表会，他告诉媒体记者希望能身体力行提倡环保，因此这次新专辑这次唱片都是使用再生纸硬盒包装，没有CD塑胶盒。
He told a press conference on Thursday in Beijing he wanted to take steps to improve the environment, so the plastic CDs feature cardboard packaging.
郑州宏威超硬材料有限公司，是一家集科研、生产、外贸一体的高新综合企业。
Zhengzhou Hongwei Superhard Materials co., Ltd is a collection of scientific research, production, integration of high-tech foreign trade enterprise General.
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