[1] Associate professor of the College of Mathematics and Statistics in Guangxi Normal University, Guilin,541006, China
[2] Department of Mathematics, College of Sciences, Shihezi University, Shihezi,832003, China
[3] Associate professor of the Guilin Tourism University, Guilin,Guangxi,541000, China
[4] Teacher of the College of Sciences, Shihezi University, Shihezi,832003, China
[5] Graduate student of the College of Sciences, Shihezi University, Shihezi,832003, China