??????????????????66?/????
????:2024-06-27 16:26:01 ??:????
????:?????????:????
?????????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?????(??????????????????)
?????????:?????????????
