人与自然和谐相处是指

几个比较伤脑筋的英语题目．1．My brother likes swimming .I like swimming,too.〔改为同义句〕2.Zhao peng is __[good] at math than Liu Hai.[注：be good at是固定搭配,能否将good转换成比较级better.] 3.The children all ov 取镁粉,铝粉,铁粉,锌粉组成的混合物17.2克,跟一定量的稀硫酸恰好完全反应.经蒸干水后,得到固体成物60.4(不含结晶水).求生成氢气多少克?这是一道初三的题 45678 计算36g水（H2O）中氢元素和氧元素质量的质量分别是多少? 已知0小于等于x小于等于1 若x2+y2=3,xy=1,则x-y= 但为何不可以是1 为了测定食盐中的钙元素含量取10g食盐溶于水、加入足量盐酸、生成0.011mg二氧化碳、计算此加钙食盐中钙元素的质量分数 【英语】高中英语选择题（ ） it is to go outing for a picnic in spring!A.How funB.How funnyC.What great funD.What a great fun-------------------------------------------------------------------------------------------参考答案是C, 已知X等于-2,Y等于2分之1求 （XY)100次方的值 若（x+2）的2次方+|y+2分之1|,则（xy）的2007次方等于（ ） 第八题, 已知x加y等于4 xy等于1 求x的5次方y的4次方加x的4次方y的5次方 x+y=-5,xy=3,则x的2次方+y的2次方等于 He can earn _______________ 100 dollars a month.A.as many as B.as many as 设X,Y为实数,求X方加2XY加2Y方减4Y加5的最小值并求出此时XY的值 when you answer question in a job interview ,please remerber the golden rule-----always give the monkey ____ he wantsA.what B.that为什么不能选B另外这是一个什么句型？为什么that不能是做he wants的宾语呢 Mom,shall I play computer games?No,________.A I'd rather not.B I'd rather you not.C I'd rather you didn'tD I'd like not to. some seemingly harmless clogs night become harmful when on the internet by millions of people .A to read B reading C read D being read 该选择哪个?求解释求说明,还有,那个打错了，是blogs，改正阿，记得阿 实数xy满足x^2+y^2+2x-4y+1=0,求下列各式的最大最小值（1）y/（x-4） （2）2x-y我想知道为什么y/（x-4） =(y-0)/(x-4),可理解为圆上点（x,y)到（4,0）点斜率的范围 题目我大都会做,希望有高手能详细解释下每道题选择这个答案的原因及相关语法点,以及其他选项的错误之处：答得好的还有加分1.it's quite obvious that the aging population in china will cause_______ heavy 1.What should Iwear for the English speaking composition?Dress------ you like.A.which B.that C.however D.whenever2.Yellow Mountain is such an attractive place of interest ------ everyone likes to visit.A.as B.that C.which D.whenever3.---------,Franks He took us on a tour__B__the place where he was born and raised.A.to B.of C.towards D.over为什么呢To most foreigners,a rising China is__B__an opportunity____a threat.A.other;than B.more;than C.better;than D.rather;than请问more...than、rather.. 1.The lawyer wasn't injured in the car accident because she ____ a seat belt.A.has on B.put on C.wore D.dressed.说说选C,不选ABD的理由2.All changes of matter ____ changes in the form of the energy.A.involve B.contain C.are made of D.inclued说 1、（空格）sugar,an apple contains plenty of water.A.apart from B.expect C.expect from D.beside2、The secretary worked late into the night,(空格)a long speech for the president.A.to prepare B.preparing C.prepared D.was preparing3、Why don no 14题化学 化学14题. 1.下列物质与水反应只做氧化剂的是（）A.Na B.Na2O2 C.F2 D.Cl22.下列物质间反应,不可能发生爆炸的是（）A.H2 F2 B.H2 I2 CH2 O2 DNa S 9、某溶液中滴入BaCl2溶液,产生白色沉淀,再滴入稀盐酸,沉淀不溶解,则该溶液中A.一定有SO42- B.可能有SO42- 或Ag+ C.一定无Ag+ D.还可能有CO32-选B 为什么? 某原子X质子数为Z质量数为A,它的氯化物XCl5.85溶于水制成溶液后,加入2摩尔每升的AgNO3溶液50毫升恰好完全反应若这种原子原子核内有12个中子,求（1）z值和A值（2）X元素在周期表中的位置.（3 同温同压下CO O2 CO2混合气体9ml点燃后爆炸,恢复到原来状态,体积减少1ml,通过足量澄清石灰水中体积又减少5ml,原混合气体中CO O2 CO2质量比可能是：A1：3：5 B5：1：3 C3：1：5 D2：4：3 一道高一化学选择题,求解析1g O2中含有a个原子,则NA可表示为________.A. (a/32)mol^-1B. (a/16)mol^-1C. 32a mol^-1D. 16a mol^-1答案为D,求解析,谢谢! 高一化学物质的量浓度题目在标准状况下,将224LHCL气体溶于635g水中,所得盐酸的密度为1.18g / cm3（1）取出上述溶液10mL,稀释至1.45L,其稀盐酸物质的量浓度为多少?（2）在40mL0.065mol/LNa2CO3溶液中, 已知实数x、y满足X2+y2-xy+2x-y+1=0,试求x、y的值