题目内容

18. 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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19. 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.

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

拉格朗日法着眼于描述液流中( )

A. 质点运动轨迹;
B. 液流占据的空间点;
C. 液体质点的运动趋势;
D. 液体质点的机械能。

流场中,任一空间点上所有运动要素均不随时间发生变化的是( )

A. 恒定流
B. 非恒定流
C. 均匀流
D. 渐变流