I have a good teacher. She is a tall woman with black hair. She is a little fat. She has two big eyes and a small nose. She likes smiling. She is very kind and patient to us. And at the same time, she is strict in class. After class, she lik
在复平面内,复数3﹣4i,i(2+i)对应的点分别为A、B,则线段AB的中点C对应的复数为( )
某批发商店进了 910 吨白糖,第一周卖出这些白糖的 13 ,第二周卖出 25 吨。还剩下多少吨?
人们认识地球的过程(下图中),正确的是
在美国历史上被誉为“开国元勋”和“黑奴解放者”的两位总统是( )