题目:液压机械传动系统由变矩器、变速器、( ) 和主减速器组成。 The hydraulic mechanical transmission system consists of a torque converter, a gearbox, (), and a final drive.
A. 主离合器Main clutch
B. 联轴器coupling
C. 万向传输装置Universal transmission device
D. 万向节a universal coupling
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