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She looks sad. Could you please tell me that prevents her from being as happy as before? [ ]
1年前
下列历史人物中不属于民族英雄的是( ) A. 岳飞 B. 郑成功 C. 戚继光 D. 华盛顿
1年前
Jeans have become one piece of clothing worn by the most people in the world.
1年前
某实验小组将重力为8.9N的实心物体放人装满水的溢水杯中,溢出1N的水。取出擦干后挂在弹簧测力计上,浸没在另一种未知液体中静止时,弹簧测力计的示数为8.1N。
1年前
若动点M到点A(2,1)的距离等于到直线x=-2的距离,求动点M的轨迹方程
1年前