(, ) , .. N+- . 50 ( 80-90 ) 50% N+- () ().
() , , +, , .
, ( ).
5. (re-entry) -, , (, ), , .
macro re-entry () micro re-entry (). (), .
a) macro re-entry :
, , ;
re-entry;
, re-entry. , ( ).
macro reentry , , .
. , , . , +-, . , .
b) micro re-entry , - . , . , , , .. .
-, , , micro re-entry. , , .
re-entry , . . , Na+- . , , . (re-entry), : , , , . re-entry , N+- (, ).
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, N+- Na+- , , .
c) (reslected re-entry) - - , .
65. . . . .
() - .
() - .
- , - - .
( , ) - , () (" ") - , .