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假如你是国家领导人，你要如何建设我国？

判定∞∑(n=1)(2ⁿ×n!)/(nⁿ)的敛散性,以及绝对收敛和条件收敛。

已知抛物线x的平方=4y上有一条长6的动弦AB 则AB中点到x轴的最短距离是？

已知函数f(x)是定义在（-∞，+∞）上的偶函数，当x属于[0,2）时，f(x)=log2（x+1),且对于x≥0都有f(x+2)=f(x).则f(-2012)+f(2013)的值为
A.1 B.2 C.3 D.4

题设是以2为底x+1的对数

f(x)=1/2x2-4lnx+3x的单调区间？急急急！

过抛物线y方=4x的焦点作直线交抛物线于A（x1，y1），B（x2，y2）两点，若x1+x2=6，那么/AB/等于多少

雌蕊将来发育成什么

已知函数f（x）=e^x-ax，g（x）=-ax[（1/2）x-1]+1
（1）已知区间[-1，1]是不等式f（x）＞0的解集的子集，求a的取值范围．
（2）已知函数φ（x）=f（x）+g（x），在函数y=φ（x）图象上任取两点A（x1，y1），B（x2，y2）.若存在a使y1-y2＜=m（x1-x2）恒成立，求m的最大值．" style="width:24px;height:24px">

关于tail-pcr原理的问题


既然SP1是特异性引物，那它为什么会与非靶序列结合呢，出现由同一特异性引物扩增出的产物

还有就是为什么只有非靶序列会出现由同一简并引物扩增出的产物，而靶序列中不会出现呢

组成DNA和ATP的元素种类不同

已知实数a,b满足ab-2b+b-4=0,且b大于2，则2a+b的最小值为（ ）、
A.3 B,4 C.5 D.6

任何时候都不要看轻自己 材料作文

　　　A very successful businessman had a meeting with his new son-in-law. “I love my __21__, and now I welcome you into the __22__,” said the man. “To show you how much we care __23__ you, I’m making you a 50-50 partner（合伙人）in my business. All you have to do is go to the __24__ every day and learn the operations…”
　　　The son-in-law __25__, “I hate factories. I can’t stand the noise.”
　　　“I see,” replied the __26__. “Well, then you’ll work in the office and take __27__ of some of the operations.”
　　　“I hate office work,” said the son-in-law. “I can’t stand being stuck __28__ an desk all day.”
　　　“Wait a minute,” said the father-in-law. “I just make you half-owner of a moneymaking organization, __29__ you don’t like factories and won’t work in an office. __30__ am I going to do with you?”
　　　“Easy,” said the yound man. “Buy me out.”

21. A. mother B. wife C. daughter D. sister
22. A. family B. business C. company D. house
23. A. with B. for C. of D. on
24. A. hospital B. factory C. shop D. school
25. A. interrupted B. asked C. stopped D. laughed
26. A. mother-in-law B. son-in-law C. daughter-in-law D. father-in-law
27. A. notes B. part C. charge D. hold
28. A. under B. behind C. on D. in
29. A. if B. until C. while D. but
30. A Where B. How C. Why D. What

“一夫荷戟大呼，则千里之将无不捐城遁逃，虏伏请降。”和“而世主未悟，谋夫景同，邳彤之廷对，其为几乎！“的翻译

怎样快速 提高文综成绩 选择题错误率太高怎么办

已知等差数列an的前n项和为sn=½n²+3/2n+t，(1)求数列通项an;(2)若数列bn满足bn=2²an+1求数列bn的前n项的和Tn

x²-5x+4≥0的不等式怎么解

写一篇1500字的检讨，因为在学校打架

结合新加坡联合早报评论从历史唯物主义角度分析改革是最大红利