trestle bay
... trepanner 凿井钻机 trestle bay 栈桥跨距 trestle 栈桥 ...
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本栈桥具有单元互换性能和可变跨距等特点，经工程使用，性能良好。
This trestle bridge is characterized by unit interchangeability and bay adjustability. The application in construction site has proved its good performance.
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