题目内容

8. Immersed in the virtual spaces through a VR headset, the author is listening to a lecture on the history of science.

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9. Several weeks after learning the bones of the human body in a VR environment, the author found the image of a particular bone was still clear and detailed.

10. VR learning environments, like those designed for gaming, are being well developed in terms of their details.

两根横截面面积不同的杆件,受到大小相同的拉力作用,则( )

A. 内力不同、应力相同
B. 内力不同、应力不同
C. 内力相同、应力不同
D. 内力相同、应力相同

关于应力,下面说法正确的是( )

A. 应力是内力的平均值
B. 应力是内力的集度
C. 杆件横截面上的正应力比斜截面的正应力大
D. 轴向拉、压杆在任何横截面上的正应力都是均匀分布的