LUO Hongfang
Yan’an Vocational & Technical College, Yan’an Shaanxi 716000, ChinaZHANG Wenzhe
Research Institute of Shaanxi Yanchang Petroleum Co., Ltd., Xi’an Shaanxi 710075, ChinaHE Xiaoqu
Yan’an Vocational & Technical College, Yan’an Shaanxi 716000, ChinaLI Guorong
Yan’an Vocational & Technical College, Yan’an Shaanxi 716000, China1.Yan’an Vocational & Technical College, Yan’an Shaanxi 716000, China;2.Research Institute of Shaanxi Yanchang Petroleum Co., Ltd., Xi’an Shaanxi 710075, China
TE254;P634