MHB ?? ????-???????????? Pb-Ca-Sn-Al ????? ??????? ????, ?? ????? ??????, ???????? ??? ????? ???? ?????????? ???? ????? ??. ?????????, ????????? ??? ??????? ???? ??????.

?? ?? ?? ??????? ????, ??????? ???? ????? ?????? ?????? ??? ????. ?????? ??? ???? ????? ????.? ???-??, ??? ??? ????? ???????? ??????? ??? ???????? ????? ??? ????? ???? ????? ??????? ???? ???? ???????????? ??????? ???? ???.

???? ?????? ?????:
???? ?????? ? ?????? ???????? ??????? ?????? ??????? ?? ???? ????? ???????? ???????????????? ?? ???? ?????? ?????????? ????, ??? ????, ????????? ????, ????? ???? ??? ?????? ???? ???? ??? ??. ???? ?????????? ????????? ???????????? ???? ??? ???? ???? ?????? ??????? ??? ??.