The design of three layer defenceconstruction joint ensures the quality of waterproof.
三道防线后浇带设计,保证后浇带防水质量并充分发挥应有的结构作用。
2
In this paper, the reconstruction of civil air defenceconstruction, development and layout of cold pipes are reported.
本文是对人防工事的改造、冷管研制和埋设及测试等的研究报告。
3
The other hand, Hebei frontier defenceconstruction caught in a dilemma after the sign of Chanyuan alliance, this forced Northern Song Dynasity very carefully.