一个国家的文盲率、义务教育普及的年限、高等教育普及的程度和这个国家的()
A.文化发展水平相关
B.科技发展水平相关
C.经济发展水平相关
D.历史延革相关
参考答案:C
By the end of last month, we had sold ____________ as we did last year.
A.as twice many cups
B.twice cups as many
C.twice as many cups
D.as many cups twice
汽车的不等速传动指的是()。
A.中间传动轴与主传动轴转速不相等
B.中间传动轴与主传动轴角速度不相等
C.汽车的前进速度是变速的
D.汽车的车轴速度不相等