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1. Digital Lux Meter AR813A.
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18. N ( ) :
1) = 200 ; 2) = 300 =1,4; z =1,1. (12x20) 2 . U =0,65. .6.
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19. , (1416) 2 = 150 =1,4 z=1,1, 1) N=18; 2) N=24; 3) N=30; 4) N=36; 5) N=40. U =0,6. .6 .
20. , (. .1 ). . .3.
1. 23-05-95. . .: , 1995. 35 .
2. .. . .: , 1981. 288 .
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