基本解释門式起重機；龍門吊車英汉例句雙語例句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.在分析門座起重機用於集裝箱裝卸作業的侷限性的基礎上，提出一種新型的起重機變幅系統。portal jib crane更多例句词组短语短語travelling portal jib crane 門式移動懸臂起重機;移動式懸臂吊車double portal jib crane 雙龍門吊portal jib crane更多词组专业释义機械工程門座式起重機經濟學門式起重機