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学习本课程的原则之一是应用为理论服务。

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机器最基本的组成有哪些？

A. 动力源
B. 控制系统
C. 执行（工作）机构
D. 检测机构
E. 传动机构

Efforts to reach the injured men have been ______ (intense) because of a sudden deterioration of weather conditions.

Three people were killed in a head-on ______ [collide] between a bus and a car.

The progressive Chinese intellectuals in the early days of the 20th century drew much of their ______ [inspire] from the revolutionary ideas flooding out of Europe at that time.