如图所示,在正六边形的a、c两个顶点上各放一带正电的点电荷,电荷量的大小都是q1,在b、d两个顶点上,各放一带负电的点电荷,电荷量的大小都是q2,q1>q2.
阅读下面的漫画,按要求答题。(4分) (1)给漫画拟出一个形象生动的标题,不超过6个字。(2分) (2)用一句话说明漫画给你的启示
动物细胞培养的特点是 ( ) ①细胞贴壁 ②有丝分裂 ③分散生长 ④接触抑制 ⑤减数分裂 ⑥培养10代以内的细胞
某烟花爆竹厂从20万件同类产品中随机抽取了100件进行质检,发现其中有5件不合格,那么你估计该厂这20万件产品中合格品约为( ) A.1万件
至20世纪末我国人民生活水平总体上达到小康水平,对此评价正确的是 ①是中华民族发展史上的一个里程碑,是人类历史上的一个奇迹 ②国家的整
—We have no idea ________. —It’s heard that he is Mr. Green’s son.A. where he comes from B. if does he live hereC. who he is
阅读短文,判断正(T)误(F)。 Americans love sports—they love to play them, to watch them on television, and to talk about them. But this hobby sometimes has serious results—at le
My family often had a get-together with friends in my childhood. As I was smart, there was always someone who would come up to mention my high intelligence and ask, What are you goin