Analyzed the tube extruding craft and principle, in this foundation, proposed the control thought and control plan of the tube extruding equipment.
分析了管材的挤出工艺及原理，在此基础上，提出了管材挤出设备的控制思想及控制方案。
The craft and principle for preparation of white silica have been proposed, which was made by physical activation, sol solution and ion interchange.
提出了锆硅渣用物理活化、胶溶、离子交换法制备白炭黑的工艺路线及原理。
Introduce making method and its principle and craft of citric acid sodium.
介绍柠檬酸钠的制备方法和它的原理及工艺。
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