右图表示人体一个细胞分裂时,细胞核中染色体数(有阴影)和DNA分子数(无阴影)在Ⅰ、Ⅱ、Ⅲ、Ⅳ四个时期的统计数据。则可能含有同源染色体的
右图是云室中某粒子穿过铅板前后的轨迹,室内匀强磁场的方向与轨迹所在平面垂直(图中垂直纸面向里),铅板上有标度,由此可知此粒子( )A
单项填空 Make a of the things you need to buy before shopping and that will save money as well as time. A. number B. list C. photo D. p
His poor _____ English prevented him _____. A. spoken; from understanding B. spoken; from being understood C. speaking; from understanding D. speaking; from being understood
美国“宪法之父”麦迪逊说,全国政府“应当在一切案件中对各州的法律享有否决权,正如同英国国王在此之前所做的那样。我认为这是十分基本的一
She was a four-year-old girl with very fine golden hair when I first met her. She was carrying a bowl of soup. I was 29 at that time and 11 from the flu. Her mom and I had been friends fo
已知集合P={1,2},那么满足QP的集合Q的个数是( )A.4 B.3 C.2 D.1
下列加线字读音正确的一组是( ) A.直言不讳(huì) 鹤长凫短(fǔ) 汗流浃背(jiá) 无耻谰言(lán) B.万箭攒心(cuán) 万马齐