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- 1设复数z=a+bi（a，b∈R），则z为纯虚数的条件是_．
- 2一个圆的半径扩大到原来的3倍,它的直径就扩大到原来的（ ）倍,周长就扩大到原来的（ ）倍,面积就扩大
- 3have too much mouths and too little ear 的中文意思?
- 4His family are watching TV 还是His family is watching TV?
- 5几道英语问题 用所给词的适当形式填空
- 6火车总质量为100t,行驶中功率保持4200kw不变,所受阻力为1×10^5N,求（1）火车加速度为2m/s^2的速度?（2）火车的最大速度?
- 7The money is used to ____ poor children study in school.
- 8我很快乐,
- 9六年级三个班在为支援汶川灾区小朋友而进行的捐图书献爱心活动中,六1班捐了总本数的40%,六2和六3比是2:3
- 10I like spring. We can go outside and ____the nature.