A.180°±10° B.180°±15° C.180°±20° D.180°±30°
A.-3.00-1.00×90 B.-2.00-1.00×100 C.-2.00-1.00×50 D.-1.75-1.00×180
A.0.50D B.0.75D C.1.00D D.1.25D