About the Authors

Dou Yong-zhi

Liuzhou OVM Engineering CO., Ltd., Liuzhou, Guangxi, China

Sun Chang-jun

Liuzhou OVM Engineering CO., Ltd., Liuzhou, Guangxi, China

Wei Fu-tang

Liuzhou OVM Engineering CO., Ltd., Liuzhou, Guangxi, China

Corresponding Author

Email: douyongzhi2005@163.com