Crane iliyonse ndi yosiyana;zina ndi zamanja zina zili ndi ma hydraulic, zina zili pagalimoto ya boom, ndipo zina siziyima kwakanthawi.Kudziwa mphamvu za momwe amagwirira ntchito kale ndi chinthu chimodzi, koma pamene mukugwira ntchito ndi zipangizo zatsopano muyenera kuyesa ntchito zake poyamba.Dziwani momwe ...
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