在这个任务中，是选取圆柱曲面做为 「主参照(Primary Reference) ；另外有两个 「二级参照(Secondary References) ，分别用来指定位移平面和角度平面。
基于4个网页-相关网页
Update: Thanks to readers for sharing concerns about contacting secondary references.
更新说明：有读者提到了对二阶受访者的担忧。
The following procedure demonstrates how to reference a DLL with secondary references that you need to include in your project.
下面的过程演示如何使用需要在项目中包括的辅助引用来引用DLL。
However, if the assembly that you want to reference has secondary references that you need to include, you must perform an extra step.
但是，如果要引用的程序集具有需要包括的辅助引用，则必须执行额外的步骤。
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