@Override
 public List<IsEvaluate> selectByCursIdAndGrade(Integer cursId, String grade) {
   return isEvaluateDao.selectByCursIdAndGrade(cursId, grade);
 }
 @Override
 public List<IsEvaluate> selectByCursId(Integer cursId) {
   return isEvaluateDao.findByCursId(cursId);
 }