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1. ?????? ?????? ?????? ????

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??? ?????? ???? ????? ???? ?????? ???? ??? ???? ??? ?????? ????? ?? ????? ?????? ???????. ???? ?????? ????? ?????? ?????? ????? ??????, ???? ????? (???? ????) ?????? ????? ?????, ?? ???? ???? ???? ????? ?? ????? ??????. ???? ???? ????? ????, ???? ?????? ?? ?????? ????? ??????, ???? ???? ?? ?????? ????? ????? ????????? ???? ????? ???? ?????? ??????? ????? ????? ??????; ???? ???? (????? ?? ????? ????) ?? ????? ?????? ?? ????, ???? ?????? ???? ????? ?? ????? ?????, ?????? ????, ?????? ?????? ???? ?? ???? ????? ????????.

2. ???? ???? ?? ????? ????? ???????

?????? ????? ????? ??????? ?? ?????? ??????? ?????? ?? ???? ?????, ?????? ????? ????? ??????.

(1) ??? ?????? ????? ???? ?? ?? ??????? ?? ???? ????? ???????

????? ????? ????? ????? ?????? ????? ????? ?????? ?? ?????? ????? ??? ????? ???????. ???, ????? ????? ???? ????? ??????? ????, ??????, ??????, ?????? ???? ??????? ??????? ???? ????? ????? ?????? ?? ???? ??????.

(2) ??? ?????? ????? ???? ?? ?? ??????? ?? ????? ????? ?????

???? ?? ??? ?? ???? ?????, ????? ????? ???? ????? ????? ????? ??????? ????? ?????? ???, ????? ????? ??? ????? ?? ????? ?? ?????? ???????, ??????? ?? ?????? ????? ????? ???????? ???????? ?????. ???? ?????? ?????? ?????? ?????? ????? ????.

1) ??? ????. ????? ??????? ?????? ????? ??????? ????????, ?????? ????? ??????? ?? ????? ????? ??????? ????? ??????? ?? ???? ????? ????? ????? ??????. ?????? ?? ???? ?? ??? ???????????? ????, ?? ?? ?? ??????? ??.

????? ???????. ?????? ?? ????? ??????? ???????? ?? ?????, ?????? ?? ???? ?????? ????????? ????? ????? ???? ?? ???? ?????? ??????? ?????? ?? ??? ????? ????? ?? ????? ?? ????, ?????? ??????? ?????? ?????? ?? ???? ??? ???? ?????.

?????, ???? ????? ?? ???? ???? ?? ?????, ?? ????? ?? ?????? ??. ????? ??????? ????, ???? ??? (t> 4mm) ??? ???? ??????? ???, ???? ??? (t <4mm) ??? ???? ??????? (?? ?? ???? ??????? ???). ??????? ????? ??????? ???, ????? ??????? ??? ?? ??????? ?? ???? ?????, ????? ????, ???? ????? ?????, ???? ????, ???? ????? ??????? ??????? ????? ????? ????.

(????: t ?????? ???? ??? ????? ?? ?????, ???? ???? ??????, ???? ????? ???? ???? ???? ????? ?- t.)

(3) ????? ????? ?? ?????? ????? ??????? ????????

?? ??????? ?????? ????? ??????? ??????? ??????? ????? ???????, ???? ???? ??? ?????, ???, ?????? ???, ?? ??? ?????? ?? ???? ???? ????? ??????.

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