At the casing factory, the foreman showed us an example of a product he had made that he deemed to be of unacceptable quality.
在一家套管厂，工头向我展示了一个产品的例子，他自己也认为这个产品的质量的确不合格。
The development background, casing property index, product process production property measuring results and casing used result in oil-field are presented.
介绍了该钢级套管的开发背景、套管的性能指标、基本生产工艺流程、实际性能检验结果及油田的使用结果。
The product fabricated by the invention enables the printing layer to be covered on the interior of the outer casing, and the color of the printing image can keep bright and is uneasy to fade away.
本发明制作的产品，将印刷层包夹在外壳的内部，可保持印刷图文颜色鲜明，不易褪色。
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