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导言1848年建成的惠林(Wheeling)悬索桥是第一座跨度超过1000英尺(300m,该桥跨度为1010英尺)的桥梁。桥梁建筑的第二个里程碑是1931年建成的乔治·华盛顿(George wash-
Introduction The Wheeling Suspension Bridge built in 1848 is the first bridge spanning more than 1,000 feet (300 meters, spanning 1010 feet). The second landmark of the bridge construction was built in 1931 by George Washington-