A.3.0D B.4.0D C.2.5D D.40D
A.OD-0.75DS/-0.50DC×180OS+0.25DS/-0.75DC×180 B.OD-1.00DS/+1.25DC×180OS-2.00DS/+1.00DC×180 C.OD+0.75DS/-0.50DC×180OS-0.25DS/-0.75DC×180 D.OD+2.75DS/-0.50DC×180OS+3.75DS/-0.75DC×180
A.30° B.120° C.150° D.60°