????2????????????

?1???26??? (? ???????)1????26??????????????????????????????,?2???,???????????????????2???????

?????????????????,2??,?0.1~0.5?,?????:????????21.0~23.4?,????????19.0~21.9?,????

?,?????(1?????????????????28?????~2???????????????????4?),???????,???????????????????,???2????3?~4?????????,????????????????????1???????????30????????????~2?????????1?????????,?1?????31?????????~2?1??????????,??????????2????1???????????????

?????????????????,????,???????????????????????,????????????????????,???????????????????????????????????????,?????????????,??????????????,????????????,?????????????????????????,??(??) ???:??