若双曲线E:-y2=1(a>0)的离心率等于,直线y=kx-1与双曲线E的右支交于A,B两点. (1)求k的取值范围; (2)若|AB|=6,点C是双曲线上一点,且,求k,m
Small children often laugh at the short ones or at someone who isn’t dressed as well as they are.But as they grow up,they learn not to hurt people’s feelings by laughing at their proble
【10湖北十堰】5.是某原子的结构示意图,以下说法正确的是:A.该原子的元素符号为X B.该原子核外电子总数为4 C.金刚石中喊有该原子
Hello,boys and girls! My name is Zhang Hanyun,and my English name is Selina Zhang. Kristy Zhang's Chinese name is also Zhang Hanyun.She is a singer(歌手).But I'm a clerk at Mr. Cool's Cl
阅读下面的文字,完成(1)—(4)题。 谢晋的人生大智慧 李世琦 就在《文化名人人生智慧丛书》送来的第二天,我从媒体上得知了谢晋去世的
下列人体细胞中分化程度最低的是 A.神经干细胞 B.胚胎干细胞 C.肝