摘要
Fig.7(a,a')on page 1289:It has come to our attention that the SEM picture of Fig.7(a,a')for the worn surface of pure EP are misused,because it has been reported in our previous work and was chosen accidentally to denote as the same control sample prepared using the exactly same procedure.The corrected Fig.7(a,a')is shown below.The data analysis,description and conclusion are not affected by this unintentional error.
