???????????20*1810*8000??q235qe????????г???????????????
??????????????????? ?????????????????????????????????????????????????????70???????50?????????????????37.7????????Щ??????????????????????????????????????????????0.7??????????????????????????????<br><br>??????????????????6??1800??8000 80??<BR>10??1800??8000 76??<BR>8??1800??8000 90??<BR>10??2000??8000 35??<BR>12??2000??
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?????????????????????????????????????????????????????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??
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???????????????????????δ???????????????????????棬???????????????????????????????????????
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???????????20*1810*8000??q235qe????????????г???????????????
