複選題73. G91 G18 S1000 M03；N1 G03 X40.0 I20.0；N2 G01 Y0.1；N3 G02 X-40.0 I-20.0；N4 G01 Y0.1；重複 N1~N4 數次，欲銑削出半圓柱面則刀具不宜選擇 (A)球形端銑刀 (B)圓鼻刀 (C)平口端銑刀 (D)圓角刀。

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 。