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1981年6期《工程机械》“起重机升降龙门架”一文介绍了一种升降式龙门架,以克服运输高度的限制和改善吊臂受力。实际使用中还
In the article of “Construction Machinery”“Cranes Lifting Gantry Frames” in 1981, an elevating gantry was introduced to overcome the limitation of transportation height and improve the force of the boom. Actual use also