???????2019-05-24
????1??ò????????????????????,???????????????????????????
????2??·????????λ??????λ??????,?????????????λ????
????3??·????????????????????м??????,????????????м??????
????4??????????????
???1????й??????????,?????????????????????????????1.2Mpa
???2???????,????????????????
???3??????????????,??????????????????????????
???4??????????,???????????????·??????????·?????????γ??????????????????
???5??????????????????,?????????????????????????????16Mpa??
???6?????????????????,??????????????????