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Quiz. Donald: And quality ______ before packaging! Angela: Ah, yes, of course! (Unit05 Episode2)

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Quiz. Maria: OK, guys, thank you for your efforts. Please keep me _____ of the development and let me know if you have any difficulties. (Unit05 Episode2)

钻孔桩水下混凝土的质量应符合哪些要求?

转体施工监控量测内容？

预应力混凝土是在构件的张拉钢筋,利用钢筋张拉后的弹性回缩,对构件受拉区域的混凝土预先施加,产生应力。