边际成本替代率是指在等产量曲线上两种生产要素相互替代的比率。 ()
A. 正确
B. 错误
Libya has never gone in for weapons of mass destruction programmes, while Iran has done it.
A. Y
B. N
C. NG
街道办事处管辖的人口一般以1万人为宜。 ()
A. 正确
B. 错误
Before 1990, the US strategic focus is on Europe and the Middle East.
A. Y
B. N
C. NG