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【单选题】
初次应答时,B细胞活化的第二信号产生主要是
A.
B细胞上的CD40与Th细胞上的CD40L结合
B.
B细胞上的B7与Th细胞上的CD28结合
C.
BCR识别抗原肽/MHCⅡ类分子复合物
D.
BCR与抗原结合
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【单选题】It will be up to the students to decide ______ the exact content of the college magazine will be.
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【判断题】钢结构受拉构件一般只须计算强度和刚度。( )
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【多选题】人寿保险均衡保险费的含义是（ ）。
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【单选题】It will be up to the students to decide ______ the exact content of the college magazine will be.
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