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若椭圆的两个焦点,短轴的一个端点构成一个正三角形,则该椭圆的离心率为 答对,I will never forget the day ＿＿ we spent together.A.which B.when C.on which D.where （选A,为什么?）I will never forget the day ＿＿ we worked together.A.which B.when C.in which D.where （选B,为什么?）两道题差不多,为什 ★几道英语选择题,请高手帮忙（讲详细些,我会追加分）★1)Walking in the hot sand,you may even have your feet____.A.burnB.burnedC.burningD.to burn2)A good way of saying"I am full"is moving____hand in circles over____stomach after 英语选择题怎么提高分数 有甲、乙、丙三种金属,将乙和丙浸入稀硫酸中,乙溶解,丙不溶,将丙浸入甲的硝酸盐溶液中,其表面有甲析出,则三种金属的活动顺序是?乙>丙>甲为什么答案是这个?拜托有人和我讲下吧 请在给出答案的同时说明下理由(有些题可以不给）1.某同学在对蜡烛的燃烧进行探究时,用燃着的火柴去点蜡烛刚熄灭时的白烟,蜡烛没有重新燃烧.其原因可能是_______________.2.加热碱式碳酸铜, 已知椭圆x^2/16+y^2/9=1的左右焦点分别为F1；F2,点P；F1；F2是一个直角三角形的三个顶点,已知椭圆x^2/16+y^2/9=1的左右焦点分别为F1；F2,点P；F1；F2是一个直角三角形的三个顶点,求点P到x轴的距离? 化学题（请说明下理由）密闭容器中发生如下反应：A（气）+2B（气）=2C（气）（可逆反应） 温度为700K时,反应达到平衡状态1.充入气体A和C,使其浓度都扩大2倍.平衡移动情况是什么?2.若充入 设椭圆的对称轴为坐标轴,短轴的一个顶点与两个焦点是同一个正三角形的顶点,焦点到椭圆的最短距离为√3,求这个椭圆的方程和离心率 16.All the bikes ______ before I ______ to the store.A.had sold out; had comeB.were sold out; had comeC.were sold out; cameD.had been sold out; came17.______ after we finish cleaning the classroom?A.What do you suppose we should do B.What you suppose What does _____ "O" mean in "WTO"?A,a B,an C,the D,/请说明理由. 1.To save more people and things,the firemen did what they could to____the big fireA.take out B.put out C.go out of D.keep out of 2.Hello.May I speak to Fu Jun,Please?Sorry.____by that name works here.A.Someday B.Anybody C.Everybody D.Nobody 若f(x)是以4为周期的奇函数,且f(-1)=a（a不等于0）,则f（9）=? 12.能正确表示下列反应的例子方程式是A.向次氯酸钙溶液通入过量CO2：Ca2++2ClO-+CO2+H2O =CaCO3↓+2HClO B.向次氯酸钙溶液通入SO2：Ca2++2ClO-+SO2+H2O= CaSO3↓+2HClO C.氢氧化钙溶液与碳酸氢镁溶液反应：HCO 函数f(x)是以π为周期的奇函数,且f(-π/4)=-1,那么f(9π/4)等于 (A) π/4 (B)-π/4 (C)1 (D)-1 英语高手请进：david promised to come round to have supper with us today.but he ___.I've been alone for half an hourA.won't B.hadn't C.hasn't D.doesn't The moment I got home,I found I _________ my jacket on the playground.A.had left B.left C.have left D.was leaving tom didn’t win ___gold last year,but this year,he got__second change.A.the a B.the the C.a a D.a theDon’t forget____the flowers.They need_____.A.to water,watering.B.watering,to water .C.water,to water D.to water,to waterDon’t be a man like him, 有几道英语选择题不明白.1.You thought I was the boss? Whatever gave you that_____?A.news B.idea C.position D.right疑问：选A.句子什么意思?D不行吗?2.Few pleasures can equal _____ of a cool drink on a hot day.A. Don't call between 12 o'clock and 1 o'clock,____I am usually having lunch.A.at which B.during which time C.by which time D.by which You can never imagine what great trouble I have had ______ the patient who received a serious wound.A.treat B.to treat C.treating D.treatedLittle Tommy was reluctant to tell the headmaster _______ he had done the day before.A.that B.how C.where D.wha 2008全国化学竞赛试题 [高中数学题]若函数f(x)=(ax b)/x (a不等于0),f(2)=1,又方程f(x)=x有唯一解,求f(x)的解析式. It is in London _______the 2012 Olympic Game will be held.A:where B:thatC:which D:whenOur life is no longer _____ it was fifty years ago.A:what B:whichC:that D:thanPlease tell the news to everyone ____is waiting outside.A:whom B:whichC:that D:what 2010全国卷理综一化学第28题题目说ABCDEF六瓶无色溶液 可答案给的A是 NH3 浙江省2010年理综试卷里的两道化学题目9.Li-Al/FeS电池是一种正在开发的车载电池,该电池中正极的电极反应式为：有关该电池的下列说法中,正确的是A.Li-Al在电池中作为负极材料,该材料中Li的 2010辽宁理综化学是不是出错题了,第一道选择题D酯的水解和酯化反应都属于取代反应B苯与溴是取代,甲苯变为苯甲酸既为氧化反应也为取代反应.附：取代反应 分子中某一原子或基团被其他原 大家帮我看几道英语选择题需要正确率谢谢The thief stole the TV,the DVD player,the computer,and the printer while we _______.Nobody heard a thing!1.have been sleeping2.were sleeping3.have slept4.had sleptListen.What a wonderful song!I 函数y=a的x-2次方+5(a>0,且a不等于1)的图像恒过定点 如果a是大于0且不等于1的实数,则函数y=a的x-3次方+3恒过定点类似于这类题目应该怎么做, 设函数y=a的|x+1|次方-1(a>o,a不等于1)则函数恒过___点,它的图像关于直线___对称 2011年全国化学1卷27 我有答案,求解析~~（2011年全国1卷27）.（15分） 下图中,A、B、C、D、E是单质,G、H、I、F是B、C、D、E分别和A形成的二元化合物.已知： ① 反应 HBGC+→+高温