【判断题】【消耗次数:1】
主法向量总是指向曲线凹入的方向.
正确
错误
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相关题目
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①  正确
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①  正确
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【单选题】 Photoshop中在路径曲线线段上,方向线和方向点的位置决定了曲线段的_______。
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①  正确
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