常見例句雙語例句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(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)。 返回 portal jib crane