?????????????????? ?????????????????
?????????,???????????????????,????????????????
?????100%???????+???????????100%????(?????50%???????)
????????????????4?????????????????????????????????100%??????????????50%???????????5????????????????????????????????
??????1+3=4?????????(?????????????????)
5??100%????50%?????????????5??????????????????????????￡????7W?????10W??? ??????????????????4?? ????3W?????5???????????50%???????5W???????2.5W???????2.5W(PK????м????????а???????PK??)
???PK?????? ??????7W-2.5W=4.5W ????????10W-3W-2.5W=4.5W
?????????????????????????????Χ??
??????1+3+5+3=12?? ?????CD????????????????????
??????м????????????
??????????????????????100%???????Ч??????50%????????????????????????????????????????????????
???????????????????????????????????????????????CD??7??12???????????????????????????????μ??????????? ??????????????????????????
