precast concrete beams.
预制的水泥桁。
凝
筋凝凝
；凝；预铸凝precast concrete beams.
预制的水泥桁。
the floors were constructed by laying down precast concrete blocks.
地面是通过铺设预制凝块建成的。
In harbour construction, precasting caissons with slipform construction technology is a new attempt.
港口施工中，利
滑模工艺预制沉箱是一种新的尝试。
The technique of pier integral precasting at the sea was researched and applied in the innavigable section construction of Donghai Bridge(the first bridge at the sea in China).
海上墩柱整体预制吊装在我国第一座外海桥梁东海大桥非通航段施工中得以研究和全面应。
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