本文研究在正态总体下，铁路装卸笨重货物专用起重机起重量的确定方法。
A method of determining elevating capacity for cranes in loading and unloading railway heavy goods is discussed, considering single loads of consignment of goods as a normal mass.
造船门式起重机是一种大起重量、大跨度、多功能、高效率的门式起重机械，专用于船坞（或船台）进行大型船体分段运输，对接及翻转作业。
Shipbuilding gantry crane a kind of gantry cranes of large lifting capacity, mare ultifunctions, and high efficiency which is dedicated for large hull staging, butt and flip operations in docks.
普通龙门起重机：这种起重机用途最广泛，可以搬运各种成件物品和散状物料，起重量在100吨以下，跨度为4 ~ 35米。
General gantry crane: the most extensive use of this crane can carry a variety of items and bulk materials into, from the weight of 100 tons, a span of 4 to 35 meters.
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