题目内容

Experts point out that people will readily see the need to____ their homes for fresh air to get rid of viruses that may cause disease.

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Our university has introduced an important new scheme in____ with IBM,which will help to prepare students for the working environment.

The speed at which new technologies are adopted and ______can affect the ability of innovators to flourish in a particular economy.

刚体在二力作用下平衡的充分必要条件包括（）

A. 大小相等
B. 方向相反
C. 作用在一条直线上
D. 作用在不同物体上

限制非自由体运动的其它物体称为（）

A. 刚体
B. 障碍
C. 限制
D. 约束