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【单选题】
关于记忆性 CD8 + T 细胞的维持描述正确的是
A.
IFN- α及 IL-15 有重要作用
B.
有赖于与 MHC Ⅰ类分子相互接触
C.
无需抗原持续刺激和 B 细胞参与及 CD4 + T 细胞辅助
D.
可能需要 T 细胞共刺激信号（ B7/CD28 ）持续存在
E.
以上均对
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A.
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【判断题】合同中的品质条款既是构成商品说明的重要部分,又是买卖双方在交接货物时对货物品质进行评定的依据。( )
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must be equal to the number of degrees of freedom for the denominator
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【判断题】合同中的品质条款既是构成商品说明的重要部分,又是买卖双方在交接货物时对货物品质进行评定的依据。( )
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must be equal to the number of degrees of freedom for the denominator
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查看完整题目与答案