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在消隐处理中，当进行平面可见性测试时，若平面的法线矢量和视线矢量的夹角小于90o，则该面（）
A
a可见b不可见c部分可见d不确定
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试题答案：
B
答案解释：
当法线矢量和视线矢量的夹角小于90o时，为不可见面。
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