????>????????
??????????
???????????????,???????20%?????,??,??,??????????2??????,??????????????????????,??????????????,??????????,??,???????????
???????????????????????,?????????????????:???????,?????????????100??1???????????800????????10mm??????????????5-18.9t/m2,????????20-75.6?,???????????????2?????59.3??3a????
????????????????????????????,?????????????????,???????????,??????????????????????,?????????????????????1?????????
?????????????10mm???????????0.5-3t/m2,????????2-10?,????????????????????????,????????????????????????????????
?????????????????????,?????????????????3%-6%??1???5.1mm?????????????10mm?????????1.44m2;??????????????????????2/3,???????????1/3?????
?????????????????????????,????????????(???),??????????,??????,???????????????????????2/3????????1/3?
????????????????????????????,?????????????????,??????????,???"??"????????????????????????,??????,???????????,????????