3.Moving Heavy Loads

Ordinarycranes,usedintheconstructionindustryorforloadingships,canliftweightsofupto200t.Butconsiderthefollowingproblems:aprefabricated1,500tsectionofaship(suchasthewholesuperstructureorthefrontpartofthebow)hastobeplacedinitsfinalposition;a6,000trockethasto ......     (本文共 6553 字 )     [阅读本文]>>




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