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问题 判断题

每个电源的电动势是由本身决定的，跟外电路的情况无关。

答案

参考答案：对

选择题
— I saw your uncle take a taxi to the airport. Why didn't you drive him there ?  
— I ___. But my car ____. 

A. would ; was fixed            
B. would have ; was fixed 
C. would have ; was being fixed  
D. did ; was being fixed
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多项选择题

CD4+T细胞的生物学作用不包括()

A．促进免疫细胞的增殖和分化

B．协调免疫细胞之间的相互作用

C．参与对靶细胞的特异性直接杀伤

D．受MHC-Ⅱ类分子限制

E．任何状态下均可通过产生CK而发挥作用
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