shampooxia
crane英[]kreɪn美[]kren词典释义hoistvt.升起,提起[机](起重机俗称)cranen.鹤;吊车,起重机hoisting machine提升机,起重机,升降机;老叼;吊车sling van吊车,吊斗
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起重机:CraneAcraneisaliftingmachineequippedwithawinder(alsocalledwireropedrum),wireropesorchainsandsheavesthatcanbeusedbothtoliftandlowermaterialsandtomovethemhorizontally.Itusesoneormoresimplemachinestocreatemechanicaladvantageandthusmoveloadsbeyondthenormalcapabilityofahuman.Cranesarecommonlyemployedinthetransportindustryfortheloadingandunloadingoffreight;intheconstructionindustryforthemovementofmaterials;andinthemanufacturingindustryfortheassemblingofheavyequipment.起重机是一个装备了络纱机(也称钢丝绳鼓),用钢丝或铁链与滑轮来升降和平移材料的,用来举重物的机器。起重机的优点在于它是由一个或更多的简单机械组成的,因而具有在远超与人力的移动装载能力。起重机在运输工业常常作为装货和卸载货物的工具;在建筑业作为运输材料的工具;并且在制造工业用来聚集重物的设备.
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