????????????????????

??????????????????,?????????????淨(jìng),?????????????????

?????????????淨(jìng)???????????????μ?????淨(jìng)????????????????

???????????????30????????μ?

??????????????????20:00????????????:0????

??????20???????4????????1????????????????????????????????????????????μ???????μ?????

??????????????????????????20????????ν?????????????????????????????????????????е?????????????????

1-10?????κ??????????10-15??????????????????15-20???????2?????????????????????????????????????????

????1??5??10??15??????????????????????????????????Ρ?