以下现象与电化腐蚀无关的是 A.黄铜(铜锌合金)制作的铜锣不易产生铜绿 B.生铁比软铁芯(几乎是纯铁)容易生锈 C.铁质器件附有铜质配件，在接触处易生
中国财政部部长谢旭人在1月10日召开的全国财政工作会议上说,2009年中国财政收入预计达到68477亿元,增长11.7%。 请回答：我国财政有哪些作用？
如果双曲线的渐近线方程渐近线为，则椭圆的离心率为A. B. C. D.
设P=1+5(x+1)+10(x+1)2+10(x+1)3+5(x+1)4+(x+1)5,则P等于( )A.x5 B.(x+2)5 C.(x-1)5 D.(x+1)5
An actor might be frightened or nervous as he moved on to the stage in front of the audience that might be friendly or perhaps unfriendly , especially if he forgot his lines. But he had to go out .
已知向量，，且 （1）求的值及单调递增区间.； （2）求在区间上的最大值和最小值..
下列属于生物影响环境的是 A．葵花朵朵向太阳 B．大树底下好乘凉 C．春风又绿江南岸 D
Was it in the bookstore stands next to No.6 Middle School ______ you found him ?A.that…which B. where …that C. which…that D. that…where
对任意的
满足
，且
，则
等于（ ）