????????????????·???????????!?????·??????????????
?? С·???
??????????30%~35%
??????????????????????3-5???????????????????????????
?λ?????С·?????????4~6????λ???ɡ?
????????????“???????”?????????“??????”
Σ????????????? ??
??С·???
??????????30%~40%
?????????????????С·????????????????????ɡ????????????漴?????????θ?????????????????? ???????ο??2500????????????ε?????
?λ??С·????2~3????????ɡ?
????????????????ɡ?
Σ????????????? ??
??С·???
??????????20%~30% ?????????????
???????????????С·????180°???????????????Ч???????????3??15~20????????
?λ??С·???????3~4????????ɡ????????1~2????????ɡ?
??????????λ??????????????????????????? ??????????????ɡ???
????λ???????
Σ?????????????
??С·????
??????????40%~60%
??????????????????ν??С????Ρ????????????Ρ??????????????????й??????????????????????????????
?λ????С·??????λ??????????????????????????????????????????????2~3????????ɡ?
???????????????????????? ????????????????????
Σ?????????????