?? ????“???????????????????”
????:1????????????:???????
2???????
3????????
4??????????
5????????
????11????????????????12?? (??????????? ???????)??(????????“???????????????”)12???????????????28?????????????????,???????????“??”,???????“??”?????????“?”??,?????,????????????“??”?
?????? ??????????,??????????????????????1000????????????????????300??????????????L30?????????M75C????????????????????4?????????????????????????
4???,???????????,??????????S????????360°????????????????????……???????????,??????????????????,??????,?????????????,???,?????
???????????????????????????L30?????????????????? ?????,??????????,????????,?????????????????????,????,????????????????????????????,??,??????????,???????????????,??????,??
????????,??????,?????????????????????,???????????
??????,?300????????????,????????????????????????????????????????,?,???????????????“??”,????????,??(????)
?????:???