It has the advantages of simple process, easy machining, low cost and obvious results.

本发明具有工艺简单、加工方便、成本低廉，效果显著的优点。

youdao

It has the advantages of simple process, easy machining, low cost and obvious results.

本发明具有工艺简单、加工方便、成本低廉，效果显著的优点。

youdao