?? ?4???49?????????? ????????
????:1??????????????:????
2?????????
3??????????
4??????????
5???????
????????????12????????????????22?????? (??????????? ?)???????????????????,12???17?????????20?????????????,???49?????????????????????????????????22???,??
?????????????????,???????????????????????1.8?????5.0??????,??100???????????????????????????????????????
????????,???????????????????????,?;??????????????,??,????????
?????????????,??????22???,????????????????,?????????????,??????????????,????????????????????15???(??) ?????:???