题目内容
单活塞杆液压缸又称为单作用液压缸。
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液压缸差动连接的目的是得到很大的输出推力。
柱塞液压缸是双作用液压缸。
It recorded over 40 kinds of diseases, and further advanced the study of disease etiology.
It systematically summed up the knowledge and experiences of the people of the Qin and Han dynasties, and also exerted important influence on the subsequent development in thefield of Chinese materia medica.
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