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英 壬 画 板inRm3D Sketchpad英壬画板(inRm3D) 使用说明书1概述.....................................................................22安装和注册..........................................................22.1系统需求........................................................22.2系统文件........................................................22.3注册...............................................................23场景控制..............................................................23.1场景属性........................................................33.2构造...............................................................54菜单、快捷键.......................................................54.1文件...............................................................54.2页面...............................................................64.3编辑...............................................................64.4显示...............................................................64.5快捷键...........................................................75构件及属性..........................................................75.1点..................................................................85.1.1 自由点.......................................................85.1.2 约束点.......................................................85.1.3 交点...........................................................95.1.4 中点...........................................................95.2直线.............................................................105.2.1 点向线.....................................................105.2.2 两点线.....................................................105.2.3 平行线.....................................................105.2.4 垂线/切线.................................................115.2.5 中线.........................................................115.3曲线.............................................................115.3.1 点法圆........................................