下面哪些关于放样中Contour和Constant Cross Section选项的叙述是正确的？（）A、只有当选择Contour时，才能使用Constant Cross Section参数，如果没有选择Contour，则不能使用Constant Cross Section。B、在路径转弯处，Constant Cross Section自动产生光滑的转角。C、只有当选择Banking时，才能使用Constant Cross Section参数，如果没有选择Banking，则不能使用Constant Cross Section。D、当没有复选Contour时，截面图形之间相互平行。
下面哪些关于放样中Contour和Constant Cross Section选项的叙述是正确的？（）
- A、只有当选择Contour时，才能使用Constant Cross Section参数，如果没有选择Contour，则不能使用Constant Cross Section。
- B、在路径转弯处，Constant Cross Section自动产生光滑的转角。
- C、只有当选择Banking时，才能使用Constant Cross Section参数，如果没有选择Banking，则不能使用Constant Cross Section。
- D、当没有复选Contour时，截面图形之间相互平行。
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