The hypoid gear is one sort of the special bevel gears. It gets comparatively extensive application in aircraft industry, automotive industry and tractor industry.

准双曲面齿轮是一种特殊的锥齿轮，它在航空、汽车、拖拉机等工业中得到了较为广泛的应用。

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The basic property of polyamide engineering plastics and application in tractor are introduced. The design and material selection of polyamide engineering plastics parts are discussed.

介绍了聚酰胺工程塑料的基本性能，在拖拉机上的应用现状及聚酰胺塑料零件的选材和设计。

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Weigeng ship, Roller-ship and Boat-shaped paddy tractor in boat-farming machinery are working in the principle of floating, which have a good application of farming in the deep mud .

船式耕作机械中的机耕船、机滚船、船形水田拖拉机都是利用浮式工作原理，在深泥脚水田的耕作中有很好的适用性。

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Greater fertilizer application, improved response to fertilizer, better tractor technology, better tillage practices, old-fashioned genetic selection, and new-fashioned genetic engineering all conspire to raise yields, year after year.

FORBES: Global Warming And Global Food Security