西方经济学说史上第一个论证了资本主义经济制度必然发生经济危机的经济学家是( )
A．萨伊
B．李嘉图
C．马尔萨斯
D．西斯蒙第
参考答案：D
- Why didn’t Sally play the violin at the concert last night?
- She said that her hand hurt,but that was only a(n) ____.I saw her play tennis just now.
A．excuse
B．matter
C．result
D．expression
相同电压等级，相同截面，铜芯的交联速度比铝芯的（）。
A.慢
B.快
C.一样
