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A brand-new jib-bridge luffing system of crane is brought out based on analysis of the limitation to handle containers of the portal crane. 在分析門座起重機(jī)用於集裝箱裝卸作業(yè)的侷限性的基礎(chǔ)上，提出一種新型的起重機(jī)變幅系統(tǒng)。