???????????????
????????
?????????????????????磬????????????????????????????????????????????????????????????λ????? m ????????? cm ????????? mm ??????????????У????????磨?壩???????????????????????λ??
????????
??????????????????????????????????????????????????????????????????????????飬????????????????????????紹???
?????????????
???????????????
10??2000??8000 21??
10??2000??8000 52??
10??2000??8000 42??
10??2000??8000 35??
12??1800??8000 42??
12??2000??8000 42??
12??2000??8000 32??
14??2000??8000 65??
???????????????7??q345qc????????嶨?????????
