修复pagecover问题

src/main/java/edu/nju/model/AnalyseVO2.java

@@ -61,6 +61,7 @@ public class AnalyseVO2 {
         this.workerDistribute = workerDistribute;
         this.workerRank = workerRank;
         this.gradeDistrubute = gradeDistrubute;
+        this.pageCover = pageCover;
     }