There were no significant correlation between Ta and Ati (r=0.105, P>0.05), Ta and Ti (r=-0.125, P>0.05) in COE.

• Ta与Ati(r =0 10 5 ,P >0 0 5 )和Ta与Ti(r =- 0 12 5 ,P >0 0 5 )均无明显的相关关系。