Normally, loader crane dealers custom-fit a frame of steel bar on top of a truck chassis to mount the crane.
通常, 装载起重机经销商随俗地在卡车底盘顶部设置铁杆梯架登上起重机。
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It is pointed out that adding column for truss can strength the cantilever, and adding attached bar can reduce unfavorable load of tower crane to cantilever truss.