材料一:进入2006年,人民币汇率再度成为国内外经济界谈论的热点。国外一些官员及政客从自身利益出发,不仅对人民币汇率肆意攻击,甚至还通过此事
He stood at the gate, __________for his mother. A. waited B. waiting C. waits D. and waiting
已知向量a=(-3,4),向量b∥a,且|b|=1,那么b= .
—Can you your absence last Friday? —Well, my car broke down and I had 10 get it taken to a garage. A. settle down B.depend on C.account for D.refer to
选修4-2:矩阵与变换(本题满分10分) 已知矩阵,若矩阵属于特征值3的一个特征向量为,属于特征值-1的一个特征向量为,求矩阵.
下列化学用语表示正确的是 A.KClO3:表示氯酸钾 B.K2MnO4:表示高锰酸钾中钾元素的化合价为+1价 C.2Fe2+:2个铁离子 D.2N2:表示两个氮原子
用恰当的化学用语回答下列问题: ⑴两个氢分子________ ;(2)n个硫酸根离子_______;(3)五氧化二氮中氮元素 显 +5 价___________;(4)最简
Women of the Night? I spent thirty-nine years of my life as an_____41_____(educate). As a school administrator, I was ever fortunate to hire a retired headmaster from Fulton County. She was a deli