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            ?????????2011-03-24 16:21 ?????????

            ?????? ????????????? 1????? ???????λ???????н???????????????????????????????е???????????????????????????????λ15-25%??????9-10%?????????0.046%???????????????????????????????? ?ó???1975???????????????????...

            1?????
                ???????λ???????н???????????????????????????????е???????????????????????????????λ15-25%??????9-10%?????????0.046%????????????????????????????????
                ?ó???1975????????????????????60??????????????豸????????????????????δ??????????????о???????????????????????????-???????????????????и??????-????????????????????????????????????????????
                ???????????????????????????????????????????????????????????
                2?????????
                ????е????????????????????????????????????????????????????????????л????????????????????????????????????????????????????????????????????е????????????????????弰????????????????????????????????彎??????????????????O??????????????????0.02-0.2mm??
                3???????
                ????????飬???????????????????????????????????????·????????ɡ??????????????????-200??85%?????125mm????????????????????????????У?????2?????????????????????????????????????????????????????????????????????????

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