问题
问答题
简述什么是机构平衡中的“质量代换”。
答案
参考答案：“质量代换”是指将构件的质量用若干集中质量来代换，并使这些代换质量与原有质量在动力学上等效。
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简述什么是机构平衡中的“质量代换”。
参考答案：“质量代换”是指将构件的质量用若干集中质量来代换，并使这些代换质量与原有质量在动力学上等效。
I like movies best. Last week, I 36 a movie called I, Robot . It tells us a story about the future with robots. It is the year of 2035 and people can see robots everywhere. Robots can help people do a lot of things, like looking 37 the old people or babies, washing, cooking, cleaning or taking dogs for a walk. Robot does everything people ask them to do 38 . But a policeman 39 Spooner doesn’t like robots. Because he doesn’t think that people can live well 40 robots.
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