The predicting formula of the drawbar pull of driven wheels running on the sand is obtained by model test.
通过模拟试验，得出了驱动轮在砂地上行驶时的挂钩牵引力预测公式。
The test result indicates that the drawbar efficiencies of the build block types are not lower than that of conventional tractors.
试验结果表明，各组合机型的牵引效率均不低于传统拖拉机的牵引效率。
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