. 4 ? . 4, 5, 6, 9, 10 ,
4-3
- -
1. a x b h . a b
- 2
() DOYPACK 90
, , -. , - , , . -
Black English .
-
- .06 - () 35.02.12 -
, 2016
. 5-6
- 5072000 -
- 8
- 4