求助工程制图1题号:1 题型:单选下列哪种曲线常用作齿轮的齿形曲线________.选项:a、螺旋线b、双曲线c、渐开线d、摆线题号:2 题型:单选题内容:角度绘制在AutoCAD中用哪种命令操作______.选项:a、

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