two span bridge
... two room dwelling 双房间一户住宅 two span bridge 双跨度桥 two stage curing 两段养护处理 ...
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单主梁桥架由单根主梁和位于跨度两边的端梁组成，双梁桥架由两根主梁和端梁组成。
Single-girder bridge by a single main beam and in the end beam span both sides of the composition, dual-beam bridge consists of two main beams and side beams formed.
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