造成基础错位事故的施工施工工艺不良主要有:(),(),模板刚度不足或支撑不良,(),混凝土浇筑工艺和振捣方法不当。
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施工中地基长期暴露,或()、或()后,未作适当处理,会引起基础错位事故发生。
基础变形事故的原因有:()、()、()及施工问题等。
泥浆护壁钻孔灌注桩施工过程中出现的主要事故有:(),(),(),钢筋笼防止与设计要求不符及断桩等
Which of the following descriptions about T cell epitope is correct?
A. It locates on the surface of antigen molecules
B. It can activate T cells directly
C. It belongs to linear epitope or conformational epitope
D. It needs to be presented by MHC molecules
E. It belongs to complete antigens