公布答案:SOLUTION 1:用新功能SPLINE BY POINT,只取两点降阶得一直线, 他的属性虽是Spline,但从数学上讲应是直线,
> Degree 1
> Number of Poles 2
> Number of Segments 1
> Number of C0 Knots 0
> Number of C1 Knots 0
> Number of C2 Knots 0
> 且由它做得EXTRUDED 面是平面
> SOLUTION 2:或在装配里用WAVE GEOMETRY LINKER----POINT/LINE