回转体截交线的实质:求截平面与曲面上被截各()的交点,然后依次光滑连接。
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根据截平面与圆柱轴线的相对位置的不同,截交线有直线、圆、椭圆三种不同的形状。
A. 对
B. 错
根据截平面与圆锥轴线的相对位置的不同,截交线有圆、椭圆、双曲线、抛物线、直线五种形状。
A. 对
B. 错
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