. , 12÷1400 3/. , , , .
.
11.
- : =1500; 1=1500; =1500; =1,995; =1,80; D=2,28; =1,950; F=0,90; =0,149; n=0,7; L=7,10.
- : : =0,4, =0,15; b=230; n=1.522;
: =450, =0,42, v=1,04/, i=0,003;
: `=450, `=0,38, v`=1,15/, i`=0,005, l=4,0;
7.8.
. 7.8 .
1- ; 2- ; 3- ; 4- ; 5- ; 6- ; 7- ; 8- .