?????????
發布時間： | 瀏覽：4479 | 來源： ???
???????
???????????
1220??*2440??*20?? ???????1?22?2?44 ??20??????2.0.
?20??????????2.0??????????????????????
???????????
1.22*2.44*0.02=0.05936????
??????????
????? 900*4.2m*18mm??????????????????????????????????????
??????????900*4200*18=68040000????
?????????:90*420*1.8=68040????
????????:0.9*4.2*0.018=0.06804???
??????????1???1???1???????????????????????
???????????0.11???
