????? ?? ??????? (Letter of Credit - Letter of Credit LC) ??? ???? ???????? ?????? ???? ?? ??????????? ????????? ???????? ???????? ?????? ??? ????????? ????? ???? ???????? ????????? ??????? ???? ??? ???? ?????????? ?? ?????? ?????? ????? ??? ??? ??? ?????? ??????????? ???? ?? ?????? ??? ????????? ??