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【多选题】
CTLs are cytotoxic against tumor cells and host cells infected with intracellular pathogens. These cells usually express ____ and destroy infected cells in an antigen-specific manner that is dependent upon the expression of ____ molecules that are expressed on almost all nucleated cells in the body.A.
CD4
B.
CD8
C.
MHC I
D.
MHC II
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举一反三
【单选题】在完全竞争市场中行业的长期供给曲线取决于（ ）。
A.
SATC 曲线最低点的轨迹
B.
SMC 曲线最低点的轨迹
C.
LATC 曲线最低点的轨迹
D.
LMC 曲线最低点的轨迹
【简答题】简述体育文化产生的社会原因
【简答题】按照课本要求设置好“公司简介”文档并上传。
【简答题】One summer I was driving from my hometown of Tahoe City，Calif.，to New Orleans.In the middle of the desert, I came upon a young man standing by the roadside. He had his thumb out and held a gas can in ...
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