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为什么酸在电离产生的阳离子中只有氢离子这一中粒子初中3年级301班19号的一个疑惑 From Monday to Friday.Most people are busy working or studying.But in the evenings and weekends,they are __1__and enjoy themselves.Some watch TV or go to the cinema,others___2___sports,This is decided by their own interestsThere are many different wa 1,被称作高原之舟的是 A,骆驼 B,牦牛 C,马2,在计算机中,指令主要放在 A,存储器 B,键盘 C,鼠标3,红色和黄色混合在一起的是 A,紫 B,橙 C,粉4,济南的美称是 A,泉城 B,石头城 C,山城5,革命圣地是 A,延 1.选择填空（ ）1.Can you （ Yes,I am （ ）.A.drawing;draw B.draw;draw C.draw;drawing( )2.The grapes are ( ).I like the grapes.A.sour B.sweet C.small( )3.Listen,there is somebody knocking ( ) the door.A.to B.at C.on( )4.Can you often wash ( ) 人教版高中化学必修一第四章《非金属及化合物》总结涵盖每一小节的重点,内容具体一些,但字数不要太多. Look!There is a crowd of people over there.Go and see what ______ and buy it if it is a bargain.A.is selling B.was selling C.is being sold D.was sold 可以帮我解答一下下面这道英语选择题吗?YOU___ YOUR EFFECTIVENESS.A.ENLARGEB.MULTIPLYC.ACCELERATED.STRTCH为什么选B? 为什么盐要讲化学性质而不同酸和碱讲共性? 1.Ist dir was passiert?Nein,das Auto konnte ___ bremsen.a.beinahe noch b.gerade noch c.kaum noch d.auch noch2.Zum Wochenende fahren wir irgendwohin ___ Grüne.a.zum b.ins c zur d.in dieb.题干中的Grüne指的是什么?3.Ich arbeite wirklich gern i 请帮帮忙作一下下面的选择题,解释一下,并说明理由!1.In such dry weather the flowers will have to be watered if they___.A.have survived B.are to surviveC.would survive D.will survive2.Hand in hand 如题我就是不太理解onmouseout="mOut(this);" 和 onmouseover="mOver(this);" 这两句的意思,感激不尽!那mover函数在哪里定义?是要另外再定义一个javaScript函数吗? 1No one has yet succeeded in explaining the ___ of how life began.A cause B problem C Puzzle D reason2I've never heard such stories ___ Dad tells me.A as B that C which D what He made up an excuse when _________ why he didn’t turn up at the meeting.A.questioned B.questioning C.to be questioned D.being questionedIf you miss your ________ you’ll have to wait two more hours.A.luck B.step C.turn D.order-------What do you t I need to get up early.So please ________me_______at six o'clock.A.wake up B. get up C. ask up D.wake downMy parents took us to the US ________a special gift. A. for B.in C.as D. about 3.Let's help __________A. one 1.把一个小球轻轻放入盛满水的容器中,溢出100g水,则小球的质量（ ）A.一定等于100g B.大于或等于100g C.小于或等于100g D.一定大于100g2.小华同学把空的牙膏皮剪去尾部做成一个筒状,放入盛有水 1.it is ___ i am busy that i can not do it now.a.sinceb.reasonc.becaused.now that2.___difficult the task is,we will try to finish it on time.a.how b.howeverc.no matterd.what3.i must tell you__you fail,you should try again.a.thatb.whetherc.that isd.wh 保持氮气化学性质的最少粒子的符号 高中化学如何鉴别苯酚醛之类的有机物 每次遇到这种题就头晕 光照条件下,能和氯气反应,不能使酸性高锰酸钾溶液褪色的是什么?我认为苯和甲烷都可以,可答案就给了个甲烷... A苯的二氯代物只有三种同分异构体.B苯的核磁共振图中只有一个峰.哪一个能说明苯中不存在单双键交替?为什么? The instrument ____ was not in the laboratory.A.which the professor referred usB.to which the professor referred usC.to which the professor referred to usD.which the professor referred to us No one knows [ ]A where does he liveB which city he lives inC he lives whereD how long he live there 像2Mg+O2=2MgO氧化还原反应方程式能 写出15个么我们高一还没学那么复杂的 配平氧化还原反应方程式.( )C2O4^2-＋( )MnO4^-＋( )H^- ＝( )CO2＋( )Mn^2+＋( )H2O配平上面方程式 高中要学的氧化还原反应方程式 碱溶液有相似化学性质是因为碱溶液中都含有相同的 碱溶液具有相似的化学性质的原因是在其水溶液中含有相同的____,常见的溶于水的碱有1.2.3.;碱溶液具有相似的化学性质的原因是在其水溶液中含有相同的____,常见的溶于水的碱有:1.2.3.;微溶于 氧化还原反应的所有化学方程式 求高中化学关于氧化还原反应的方程式方程式!要有代表性. 求大量氧化还原反应的化学方程式要氧化还原反应的,我要练一练化双线桥,没配平的也可以 碱溶液具有相似的化学性质,是因为它们的水溶液中都只有一种阴离子（ ）；酸溶液也具有相似的化学性质,是因为它们的水溶液中都只有一种阳离子（ ）. 氧化物与碱进行氧化还原反应化学方程式