用英语介绍一款工程机械产品!有中英文对照.随便什么产品都可以!
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起重机行吗?

portal crane has various applications,such as,loading and unloading at port,shipbuilding and repairing yard,steel plants.the main structures are:steel structure,lifting mechnism,slewing mechanism,traveling mechanism,spreader device(grab,container spreader,hook),electrical equipment and other auxiliary devices of safety.applied rigid rack and screw lever luffing mechanism make sure a constant working state.

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