()
=
(A)
A 15
20 A
( )
........
12 ( )
120 (w)
120 12 = 10
15
http://www.4shared.com/file/kZWGgL-j/fues.htm
( )
...........
( )
()
()
...
( )
= ()
( )
( )
............
()
() ()
()