为小四轮拖拉机发动机的降噪指明了方向。
Ways to reduce engine noise for small-wheeled tractors have been indicated.
为小四轮拖拉机发动机的降噪指明了方向。
The way to reduce the noise of the engine of the small four-wheel tractor is pointed out.
介绍了小四轮拖拉机挂车气刹系统与挂车参数；
This paper discusses the parameters of trailer air brake system and trailers for small wheeled tractors.
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