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41.为什么说翻垡的稳定性与耕深有关? 北方旱田用的滚垡犁(因土垡翻转过程中是沿犁铧曲面翻滚而得名),它的耕宽与耕深有一定的比例要求,通常用宽深比k表示,即k=b/a 式中:b—耕宽,a—耕深。宽深比k的大小要根据翻垡的稳定性来确定。为研究问题方便起见,先假设土垡翻转时不受破坏(在草甸地开荒时可以看到这种完整垡片)。下面来观察土垡沿犁铧曲面的翻转过程:先是铧
41. Why do we say that the stability of turning over is related to the tillage depth? The rolling trowel plow used in the northern dry land (named after the tumbling of the plowshare in the tipping over of the soil) has a certain ratio of tillage to tillage , Which is usually expressed in terms of width-to-depth ratio k, that is, k = b / a where: b - tillage, a- tillage. The width-to-depth ratio k is determined by the stability of the turn-over. For the convenience of studying the problem, we first assume that the soil is not damaged when it is flipped (this complete blade can be seen when land reclamation is made on meadow). The following to observe the soil Tuo Hua Plow along the surface of the turning process: first Hua