Some even have laboratory, technical personnel's knowledge of artificial can not adapt to the present situation is the master and correct use of sand.
有的即使有实验室，技术人员的知识现状也不能适应对人工砂的掌握与正确使用。
This article disclosed the present situation and future trend of domestic polyurethane laminating adhesive market. The technical progress of the adhesive at home and abroad was also introduced.
简要介绍了国内复合薄膜用聚氨酯胶粘剂的市场状况及未来市场预测，同时对其技术进展情况也进行了介绍，并与国外的现状进行了对比。
Present situation, production process, material features, technical effect and economical benefits of coppe-steel back composite for mechanical use were presented in the paper.
介绍了机械用铜-钢背复合材料的现状，制备工艺，材料特点，以及技术经济效果。
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