flitch-trussed beam
... 触发级 flip-flop stage 组合桁架梁 flitch-trussed beam 浮动；浮子，浮筒；轴向间隙；进度裕量(项目审评技术) float ...
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钢桁架两榀一组，采用对称钢桁架梁组合结构。
Two steel trusses are in a group, and symmetrical steel truss beam combination structure is adopted.
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