如图示建�工地上的塔式起重机示意图它是通过电动机带动如图乙所示�轮组起吊物料的.如果这个�轮组把6×103n的重物在20秒内匀速提升10m Template




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tomski如图示建�工地上的塔式起重机示意图它是通过电动机带动如图乙所示�轮组起吊物料的.如果这个�轮组把6×103n的重物在20秒内匀速提升10m coloring