Mike is seven years old now and begins(开始) to go to school. His father is a driver and takes him to school in his car. Mike studies very hard(努力地) and all his teachers like him very much.
由Na、Mg、Al、Fe四种金属单质中的两种组成的混合物共24克,跟足量盐酸反应,产生11.2LH2(标准状况下),由此可以判断混合物中必定含有( ) A. Fe
暑假即将来临，你班同学讨论了假期计划，提出了不同看法。请根据提示写一篇有关讨论的英语短文，并谈谈你的看法。 优 点缺 点待在家中
设抛物线y2=2px(p＞0)的焦点为F,经过点F的直线交抛物线于A、B两点,点C在抛物线的准线上,且BC∥x轴,求证:AC经过原点.
若f(x)=(x-1)4+4(x-1)3 +6(x-1)2 +4x-3，则f()的值为A.4 B.4 C.2 D.
Talking of the car accident, there is in today’s paper an accurate account of ________ it happened last night． A．which B．how C．when D
氦3原子核内有2个质子和一个中子，则这种原子的核外电子数为 A. 1个 B. 3个 C. 4个 D. 2个
，若R为实数集，
（ ）
B．
C．
D．
