题目内容
液压系统由哪5个部分组成?
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液压传动的两个重要特性是什么?
In the Song dynasty, Chuiwan, a primitive soccer game using a leather ball filled with hair, etc. was very popular among people.
Tai Chi Chuan, also called deep breathing exercise, is practiced by the Chinese on a regular basis to keep fit.
The first modern Olympic Games was held in Athens in 1896, and the Olympic motto is faster, higher, stronger.
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