(a) (b) (c) d h 75 75 50mm 6 mm 100 mm C10
s h0 N i y i Y X X N i y i h0 (b) s Y (a) as c2 a c1 (c)
F 45 45 ao x hc h0 1 ao y bc h0
h0 45 45 bc h0 a1y c2 c1 a1x hc c2 a1y c1 a1x
2 c2 a1 2 1 c1 a11
h0 ax boy ay h0 V V bax
l40d 50 6d1 d1 150