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

? ??? ???? ????, ??????? ?????? ????? ????? ????????? (?????? "?????? ?????" ?????? ????????) ??????? ?????? ???? ????? ??????????? ????????? ???????????? ??????????? ?????? ????? ????.

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