???? ???????????? ?????? ??? ???? ?????????
প্রকাশিত:2022/7/22 13:56:55?????????? ??????Chinese ????????????? ????? ???s
????? ???????????????????? ????? ?????????? ?????? ??????? ???????? ???? ?? ??????? ?????? ???? ?????????? ???? ??????? ???????? ??? ???? ????? ??? ?? ????? ????????? ???????? ??? ???????? ?????? ??? ???? ????? ??????? ???????? ?? ??????? ???? ??? ??? ??????? ??? ????????????? ????? ????? ??????? ?????????? ??? ????? In such a case, the steel surface has dust, and the rust layer has micropores and gaps, which cause the microscope to absorb and produce invisible shrinkage water. ?? ?????? ??????????? ??? ??????? ??? ????? ????? ?????? ?????? ???? ????? ????? ??? ????? ?????
?????????? ????? ????? ????? ??????? ???????????? ???????? ????? ?????????? ????? ????? ????? ??????? ??? ?????????? ????? ????? ????? ???? ??????? ?? ??? ?
??????, ??????? ????? ????? ???? ????, ?? ????? ???? ??? ?????? ?? ?????????? ?????? ???? ???? ???? ??? ??? ????????? ??? ????? ???? ????? ??????? ?????? ??????? ?????????? ????? ??????? ????? ???? ???????? ??????? ?????, ??? ??? ???? ?????? ????????????? ??? ?????? ????????????? ?????
??????? ??? ?? ?????? ???? ??? ?????? ??? ??????????? ????? ?????? ???????????? ?????? ???? ???? ??????? ??? ??, ??? ??????? ????? ?????????? ?????? ??????? ??? ?? “ ??? ?????? ". ????? ???? ?????? ??? ???? ???? ???? ??? ??????? ?????????? ?? ????? ??? ???? ??, ?????? ??????? ???????? ??????? ?????????? ???? ?????? This is the characteristic of steel. ???, ????? ?????? ??????? ????? ??? ?????? ???? ????
???????? ??????? ???????? ????????? ????? ??????? ???????? ???? ???? ????? ???????? ???? ????? ????? ?????
