????????pvc?6????????????????(????)?2?????(????)??,??????,?????
??????????????????:??????(9m)???????????????????,??????????,????????,???????(9m)?????????????????????,???????????????????????????????????5?????????6?
?????????????????,??????????????????????????????????????????????????
??????????????????????,??????????????????1m/?,??????2.5m?,??????;??????3m?,????????,???????3m/?;???????f16?????,????????pvc??7????????????????(????)
????????????????“?”???,????????????4??????????????????????????,?????
4.2????????????????????,???????????????????????????,??????????????,???????????,?????,????????10x10x10cm??????????????4.3 ?????????????????????,???????,
???: ????????
???: ??????????(alc?)????
????
????