?? “??????”?????? 12?21?????
????:1????????????:???????
2??????????
3????????????
4???200?2??
5????????
????????????????????????12??????21???(?????? ???????????)21??,??3???????????????????????,“??????????????”??,??
12???21???,????3????????????????????????,“???????????”??? ? ????????????????????“??????????????”,?????????????????,??,??????10?????????????????????????????,????????????????????????
??,“???,????,?????,??????,?,?????????”
???????????“??”???? ?????????????? ?????,????????????????????,“?”?????????,????????1000??????????,????3000??????????????
?,“??????”?????????,???????????????,??????LED???????????,?????????????????????????????????,?????????????????????????
“???”??????,???????? ?? ?????????,??????????????,?,????????“???+??”??,??????????????????120????????????????????????,???????????????????????????????????,????????????????,??(??????)
?????:???????????????