????:1????????:??????

2????????

3????????

4???????????

5?????????

6?????16??,??????????????????,?????????????????????,???????30????50??????????,??

?,????????????????????????????,???????????????????????,???????,????????,30%??????????????,20%??????,?????????“???????,??????,?????????????,???????????????????????,????????????????”???,??????????????,??????????,????????????????,??CT??????,???????

??,???????????????,?????B????,????????????????????,????????????5????????????,???,??????????????,???????????

??????????????? ??????????????? ??/? ???????????? ???????:?????????