Supported by The National Natural Science Foundation of China(10771171);555 Innovation Talent Project of Gansu Province(GS-555-CXRC);Technique Innovation Project of Northwest Normal University(NWNU-KJCXGC-212);Important Foundation of Dingxi Teachers College(TD2016ZD06)
The work was supported by NSFC(10771171);555 Innovation Talent Project of Gansu Province(GS-555-CXRC);Technique Innovation Project of Northwest Normal University(NWNU-KJCXGC-212);Youth Foundation of Dingxi Teachers College(1333)