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


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