???????????20*1810*8000??q235qe????????г???????????????
???????????????????
?????????????????????????????????????????????????????70???????50?????????????????37.7????????Щ??????????????????????????????????????????????0.7??????????????????????????????
??????????????????
6??1800??8000 80??
10??1800??8000 76??
8??1800??8000 90??
10??2000??8000 35??
12??2000??8000 42??
14??2000??8000 21??
3??1250??6000 75??
????????
???????????????????????????????????????????????????л????????????????????????????????????
???????????????????????δ???????????????????????棬???????????????????????????????????????
???????????????????????????????????????????? ??
???????????20*1810*8000??q235qe????????????г???????????????
