52. 以直徑 10 端銑刀銑削圓弧溝槽，尺寸如下圖，若程式為 G90 G00 XαYβ; G01 Z-3.0 F50; G91 G17 G02 Xγ Yδ R30.0; 則 (sin22.5°=0.38268, cos22.5°=0.92388,tan22.5°=0.41421)(A)α=11.481, β=-27.716 ,γ=11.481, δ=27.716 (B)α=-11.481, β=27.716 ,γ=22.962, δ=0(C)α=11.481, β=-27.716 ,γ=22.962, δ=27.716 (D)α=-11.481, β=27.716 ,γ=11.481, δ=0 。