A、<span style="font-size: 16.8px; background-color: rgb(255, 255, 255);">圆弧、圆、椭圆弧</span>
B、<span style="font-size: 16.8px; background-color: rgb(255, 255, 255);">直线</span>
C、<span style="font-size: 16.8px; background-color: rgb(255, 255, 255);">多线</span>
D、<span style="font-size: 16.8px; background-color: rgb(255, 255, 255);">射线、构造线和样条曲线</span>