?? ?66??????????????????/????
????:1??????????:???????
2??????????
3?????qq??
4???????????
5??????????
??6??????????????????????27?????? (????????????????????????????? ?????????)??????????27?,?66????/????????????
???????????????? ????????????,????????????????????,????????????(?????????????????????)??????,??
?????????«??»(JT/T489-2019),??????66????/??,????,????????(??)??37?????????/?????23?/????????????(?)???????????????6???/??;1???????????4?????????????1?1.5?2?3,???3???????????????????4???????????60%??????????????????;1????????????????6????1?2.1?3.16?3.75?3.86?4.09,???
??,???????????????????????30??????????????,???????????31?,????????,??,??????,??,???????????“????????????????”????,?24???,????6??(?)
?????????:????