A.L-2c+2×0.268H′ B.L-2c+2×0.414H′ C.L-2c+2×0.577H′ D.L-2c+2×0.115H′
A.1.015 B.1.025 C.1.02 D.1.035
A.-350mm B.+350mm C.+300mm D.直接