1?????????????15?????ζ??25????????????1??????????2?η??????????????????????????4?????????Ч??
2????????ζ???12???????15????????????1??????2?η??????????????????3~10??????????????20~30?????????
3??????30???????6?????????15???????10???????2???·??????1????
4?????Ρ????θ?30?????ζ??20?????10????????3????????????1?????????????η???15???1?????????1?????????Ч??