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L=420, D? =55, D? =54, D? =45 19*10*10..
d = 90 (6*10) 4*12 6*12 (200*150)d=14250*180..
..
z-12D-82..
40 , 23 ,..
L=250, D? =55, D? =66, 21 , 32 ..
D1=170mmD2=64mmd=50mmZ=5421 ,..