定义在某区间上的函数满足对该区间上的任意两个数总有不等式成立，则称函数为该区间上的上凸函数. 类比上述定义，对于数列，如果对任意正整数，
在孟德尔的豌豆杂交实验中，说法不正确的是（ ）A．自然状态下的豌豆为纯种B．高茎和矮茎杂交，子一代全部表现为高茎，说明高茎为显性
41. Mr. Smith is very kind-hearted and capable. You are really _______ in having such a good teacher. A. sorry B. sad C. poor
通过近一年的化学学习,你已经掌握了实验室制取气体的有关方法,请根据下图回答问题: (1)以上装置A~F中有一处明显的错误,请加以改正 ;利用改正后的装
下列有关名著的说明，不正确的两项是【 】【 】 A.《红楼梦》里有句话说：“一个是阆苑仙葩，一个是美玉无瑕”，其中“阆苑仙葩”指
D Americans can travel almost anywhere they choose. But to protect its people, the government lists a few dangerous places where Americans cannot go. These places are unfriendly countries or coun
Have you ever been to the world’s smallest bookstore? The World’s Smallest Bookstore, whose official name is just these three words, sits quietly about 100 miles northeast of Toronto. The books
真核细胞的分裂方式包括 （ ） A．无性繁殖、无丝分裂和减数分裂 B．有丝分裂、减数分裂和无丝分裂 C．有丝分裂、二分裂和无丝分裂 D．细胞增
