roller tractor

基本解釋

Forced-hardening test on roller samples with different diameter was conducted based on the truck's and tractor's half axis made of used 45 steel by shell quenching .
在對汽車、拖拉機半軸采用45鋼薄殼淬火的基礎(chǔ)上，對45鋼不同直徑的圓柱試樣進行了噴水淬火試驗。
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 .
船式耕作機械中的機耕船、機滾船、船形水田拖拉機都是利用浮式工作原理，在深泥腳水田的耕作中有很好的適用性。