题目内容

In what condition will a university be at a competitive disadvantage according to a university president?

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Why are colleges around the world replacing their computer systems?

由一条母线(直线或曲线)围绕轴线回转形成的曲面,称为____。

回转面有一重要特性,母线上任意一点的回转运动轨迹是一个垂直于轴线的____。

曲面上任一位置的母线称为曲面的____。