The method of the invention is simple in technology, easy in material obtaining, low in cost, easy in popularization and utilization, and suitable for large-scale industrial production.
本发明方法工艺简单、原料易得、成本低、易于推广应用，适于规模型工业化生产。
The utility model has the advantages of simple structure, simple manufacturing technology and low production cost, and is suitable for popularization and application.
优点是结构简单、制造工艺简单、生产成本低、适于推广应用。
The utility model has the advantages of simple structure, simple manufacturing technology and low production cost, and is suitable for popularization and application.
优点是结构简单、制造工艺简单、生产成本低、适于推广应用。
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