vertical beam ditcher.
竖杆挖沟机
Motional Stress Analysis and Structural Optimization on Chain of Ditcher
链式开沟机链节运动受力状况与结构优化
Equilibrium Theory of Chain Ditcher with Sloping from Ahead to Behind and Preceding Cutter
链刀前置后倾式开沟机的平衡理论
Tolerance of Chain Contact Pitch and Chain Length in the New Edaphic and Mineral Chain Ditcher
刀式矿土复合型链条接触节距及链长公差的研究
I have already mentioned the labour of the hedger and ditcher, of the builder of walls or dykes.
我已提及了筑篱、挖沟、砌墙或建防护栏的劳动。
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