【单选题】如果一个医院提高某种服务的价格后,发现收入增加这意味着:
【判断题】SDS-PAGE电泳时,上面为分离胶,下面为浓缩胶。
【单选题】Do you know nearly ________of our body is water?
【单选题】下列各项叙述中,不正确的是()
A.
双亲表现型正常,生出一个患病女儿为常染色体隐性遗传病
B.
母亲患病,父亲正常,子代中有正常儿子,则该病不是X染色体隐性遗传
D.
一个具有n对等位基因的杂合体,必定产生2n种各类型数量相等的配子
【简答题】The family man? Father was a hardworking man who tried his best to support his wife and three children. He spent all his evenings attending classes, hoping to improve himself so that he could one day ...
【单选题】What does the author think teachers do which they should not do? ______
A.
They give children correct answers.
B.
They point out children's mistakes to them.
C.
They allow children to mark their own work.
D.
They encourage children to copy from one another.
【单选题】X染色体隐性遗传中,表型正常的女性杂合子携带者与正常男性婚配后,下一代中( )。