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1.在一个长931m注满水的长直铁管一端敲一下,在另一端听到三次声音,第一次和第二次间隔0.4s,第二次和第三次间隔2.1s,当时空气中的声速为340m/s.则铁管中和水中的声速各是多少?2.一辆汽车沿平 求几道初二上册超难的物理题谁能给我几道初二上册的超级难的物理题!要超级难的!小儿科的不要!或是能误导人,类似于脑筋急转弯的也行.是初二上册的,不过这道题我快做100遍了 求1.lucy is so u__ that we all like to share our worries with her.2.i hope to i__ my relationship between my family and friends.3.i d__ with your idea. 英语作业练习题 英语题目,作业,急!There isn't anything t______in this article.No wonder nobody believes it. 英语习题作业 TOW收到了TOMY的邮箱以后,也制定了自己的周末计划,请你根据TOW的计划表,写一封邮件给TONY 谁有名师伴你行 高一数学上答案啊? 名师伴你行2010高一数学答案急求 当x取何值时,2(3x+4)的值比5(2x-1)的值大3 十万火急!高一数学《名师伴你行》人教A版必修三,第一章检测题答案 我在某某学校读书怎么用英语怎么说 学英语有没有什么窍门!给我分享下!我不在读书!只是想学英语 读书和学英语怎样才能平衡 2x－1／5＋3x＋1／3＝x＋2解方程：2x－1／5＋3x＋1／3＝x＋2 (3x+5)÷(2x-3)=2 x=? 已知函数f(x)=根号3sin2x-2sin平方x,求函数的单调减区间为什么最后结尾为2kπ＋π/2≤2x+π/6≤2kπ＋3π/2,得：kπ＋π/6≤x≤kπ＋2π/3的原因,附 其它计算鄙人已明了. 已知f(x)=根号3sin2x-2sin平方x+2,x属于R （1）求函数f(x）的最大值及对应的x的取值范围（2）画出y=f（x）在闭区间0，π上的图像大致图像就可以 the whole generation were brought up to be _____ of material things,so that they had great difficulty settling down to a market economy.为什么是scornful不是proud?讲详细点噢, 帮我解决几道大一英语选择题In_____of all the difficulties,he managed to accomplish his aim at last.hope spite search The little boy,Johnnie,had been up with a _____of mints.A、pack B、packed C、package 5.Dozens of scientific groups all over theworld have been _____ the goal of a practical and economic way to use sunlightto split water molecules.A)pursuing B) chasing C) reaching D)winning 13.Nowadays,many services are makingarbitrary charges of ____ Children are the most vulnerable members of （ ） A.society B.lifetime C.relationship D.counseing 11.There is no doubt that the ____________ of these goods to the others is easy to see.A.prestige B.superiority C.priority D.publicity 12.In November 1987 the government __________ a public debate on the future direction of the official sports policy 已知x^2—3x+1=0求x—1/x 已知x^2-3x+1=0,则x^2+1/x^2=______ 已知x*x-3x+1=0求√(x*x+1/x-2)=? 人教版新高一数学必修4红对勾答案!急!在线等! 高一数学必修一红对勾本册综合评估试卷答案要得是内蒙古大学出版社的,卷子页数是113~116,人教A版的 谁有高一数学必修5红对勾的答案 高一数学必修二红对勾答案 ###人教版A高一数学必修5红对勾第一章综合评估1答案###RT 数学函数概念函数f(x)=x+1,函数是一个数（一个变量他的值由x决定）,还是一个由x经过f得到y整个这个过程叫函数