强调发展中国家应该重视发展农业的经济学家是
A.罗斯托
B.舒尔茨
C.刘易斯
D.赫希曼
正确答案是B
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固定偏置放大电路如题32图所示,已知晶体管的β=50。要求:(1)确定电路的工作状态;(2)当换成β=100的晶体管时,晶体管的工作状态有无变化?试通过计算说明理由。Ideals in delivers which someone responsibility beyond what miserable entire feels how In my years of teaching, I have had so many students come to talk about their deeply personal matters that they had shared with no one else. This always _51_ lik