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
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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
Which of the followings is both an antigen and an antibody to human being
A. Bacterial exotoxin
B. Horse anti-tetanus serum
C. Toxoid
D. HLA
E. Interferon
The different antigens existing in different individuals of the same species are called
A. Idiotypic antigens
B. Autoantigens
C. Xenoantigens
D. Alloantigens
E. Heterophilic antigens
Which of the followings is correct about hapten?
A. It has immunogenicity and immunoreactivity
B. It has immunogenicity and no immunoreactivity
C. It has immunoreactivity but no immunogenicity
D. Only after binding with the carrier can it bind to the corresponding antibody
E. It is a polyclonal activator
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