今天美国发生8.1地震

I don't have time for this解释一下这句话 一种DVD机,现在售价每台980,比原来降低了200元,每台降价百分之几? 16.9% 20.4% 哪个对 诗《石灰吟》和《竹石》抒发了作者怎样的感情 2x^3-x+1的极限x趋于无穷1\请解答这个题.2\另,无穷大的性质怎么由无穷小的那几个推论得出?3\可以说有限个无穷大也是无穷大吗?4\无穷大与常数之和是什么有限个无穷大也是无穷大这个结论是 You should keep your desk clean(改为否定句) 连词成句classroom,think,clean,do,should,who,the,you 集合M={x|x=nπ+π/2,n∈z},N={x|x=2kπ±π/2,k∈z}的关系为求详解 (2x－3)∧5(3x+2)∧4/(4x^3+2x)^3求x趋近于无穷的极限具体过程 西铁城机械手表 如何?在线求,到底如何? 西铁城机械手表怎么样 江山市有哪些县 我们应该怎样关爱班集体 我们应该如何关爱班集体 如何关爱班级 请问社区或街道党组织的上一级党组织是什么? 如果A={α|α=2kπ+π/12,k∈Z },B={α|α=kπ-11π/12,k∈Z },那么A:A真包含于BB:A真包含BC:A∩B=空集D:A补∩B=空集 当α∈（2kπ+π,2kπ+7/6π）,k∈Z方程√|x-1|=xsinα的解的个数 把92π/7化成a+2kπ(0 英语翻译 他发生了什么事（become) 关于电学的一道计算题!有两个导体,电阻分别为10欧和30欧.把它们串联后通过10欧电阻的电流是0.5安,求电源电压. 一道电学分析计算题某电阻在电路两端的电压不变的情况下,阻值增加2欧,这时电流变为原来的2/3,则原来的电阻为多少? 一艘轮船逆流航行,每小时12千米,7小时达到乙港,从甲返回要6小时,船在静水中点速度和水流速? He t___ to listen carefully,and write down what the teacher said. He let me write down his instruction___ sure that I would know what was ___ after he went away.A.to make; to do B,to make to be done. right here waiting,right or wrong 很急!六年级数学! the young man sat there smoking,_____ of sorrowA was full B full 选哪个,为什么? The young man sat back in his sofa,_______ with what he had worked out to do with the remainingThe young man sat back in his sofa,_______ with what he had workedout to do with the remaining work.A.having satisfied B.being satisfied C.To be satisfied 三次根号1728 wrong is happy,right is sorrow是什么意思 nothing is right nothing is wrong是什么意思nothing is right nothing is wrong谁能告诉我 英语必修4第一课Reading翻译(a student of African widlife)全文