知識貝殼
知識貝殼
所屬欄目：建筑施工英語
Ordinarycranes,usedintheconstructionindustryorforloadingships,canliftweightsofupto200t.Butconsiderthefollowingproblems:aprefabricated1,500tsectionofaship(suchasthewholesuperstructureorthefrontpartofthebow)hastobeplacedinitsfinalposition;a6,000trockethasto ......（本文共 6553 字 ） [閱讀本文] >>