国外先进技术和设备的引进，各类大型制酸装置的国产化设计，使我国的硫酸工程设计水平大为提高。
Introduction of advanced technique and equipment from abroad and domestic design of large scale plants improve China's sulphuric acid engineering level.
阐述了电力线路张力放线自制牵引机设计中与进口设备完全不同的一种新型液压驱动设计方案，该方案使电力线路张力放线液压系统元件国产化得以实现。
The design of a new type of hydraulic system was introduced, which was totally different from the imports. And the localization of this system has been realized.
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