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1 ????PE?????涨
(1)?????????????????????????????????????.?????????е????,?????????????С??0. 7m.
(2)????????·????··??????????.?????????????????????????????,???????????????300m,?????????·????й?涨???.
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2????
(1)???????????,????????????????????,????????????????????,??????De<300mm?.???????????0. 4m;??????315<De<800mm?,?????????????0. 6m???.
(2)???????,????????????,?????????????????.?????????????????,???????????,?????10-15mm???????????????????С??40mm?????,????????.
(3)??????,?????????????????,????????????.???????????,???????????????????.??????????д??.
(4)?????.???????????????????????????????????????,????????????????????.
3???????
(1)????????????????????.????????????,?????????????0. l m????????,????????????????????λ?????,??????????5-40mm????????,????????150mm,??????????,??????С??50mm.http://www.cqyjgd.com ????PE??
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