The study of science has e__________all our lives.
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A fall in unemployment will help to restore consumer c___________.
The research has y__________useful information.
The ceremony was t__________live by satellite to over fifty countries.
什么约束能够在装配环境中直接驱动？
A. 插入约束
B. 转动-平动约束
C. 角度约束
D. 过渡约束
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