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求原因.第五题 在一定条件下,同一反应进行的快慢与反应物的浓度成正比.现用100克质量百分比浓度为30%的硫酸溶液与过量的镁粉反应,为了使反应慢一点而不影响生成氢气的总量,可向所用的硫酸中加入适量 五道化学选择题,谢谢大家了~1.将3g某白色粉末加入到10g热水中,冷却到室温时,析出2g粉末.将析出的2g粉末再加入10g热水中,冷却到室温时,又析出1.5g,由此可以确定该粉末一定是（ ）A.纯净 选D, 一个简单的化学选择题,非常感谢!①http://gzhx.cooco.net.cn/testdetail/130696/A为什么是对的?我可能相对原子质量这里没有学好,因为课本没说,所以不是很理解,所以能不能从头到尾把所有有关的详细 多选题正确的是_____A通常的雨水是软水B通过静置操作可降低水的硬度C被污染的水,经过过滤可以消除污染 ：）下班前最后一题.）I would appreciate ___ it a secret.a;your keepingb:to be finedc:that you keepd:that you will keep选哪个呢?感觉C比较像.但是will这里要不要加呢? Their dog was a substitute ___ the children they had never had.a:asb:ofc:tod:for感觉a和d比较像.是哪个呢?-.-另外 never had是个固定词组吗?还是 never have也可以? I wish I __ longer this morning,but I had to get up and come to class.a:could have sleptb:sleptc:might have sleptd:have slept看句子似乎是虚拟语气.A.C中选那个比较好呢：） The experiment can not be carried out because of ___.A:the equipment is destroyedb:the equipment to be destroyedc:the equipment being destroyedd:the equipment has been destroyed.是不是选D啊?destroy的过去分词是直接加ed?不是去掉Y加ie 【英语】一道选择题the information on the internet gets around much more rapidly than ____ in the newspaper A itB that为什么答案选B不选A 半摇滚的英文歌请给我推荐些呀?谢谢大叔大婶们了 求高手解答两道英语选择题 ,今天 期末的题1.Do you konw ()man standing there?I onlu know he is from ()European country.A the a B:a the2.I gave up the piano lessons because I have so much homework to do,but it is ()my own wishes.A in 求解- 英语题目不会做 各位大叔大婶帮帮我啊 帮我的瘦十斤-6．We are supposed to tell the t . 7．Be c of the dog that does not bark. 8．I believe s in my thoughts. 9．The slogan a 我这里有几道英语的单项选择题,我不太懂,1.---Shall we go outing this weekend?---Oh,with all this work( ),I don't know if I'll have time to go outA to do B doing C done D do2.Working in an air-conditioned office,you can hardly imagine 下面有几道英语的选择题,不太懂、清楚,要解释下1. i have many friends,…of whom…… some　are businessmen这道题为什么要加介词of,2. the place.the bridge is supposed to be built should be. the cross-river traffic is the 挺简单的选择题（英语）但我不太懂.Let's( )this is happening now.A.say B.says C.to say D.saying 有几个英语选择题不太懂 帮我选下呵呵1.the bank is reported in the local newspaper __in broad yesterdaya.to be robbed b.robbed.c.to have been robbed d.having been robbed2.Contrast may make something appear more beautiful than it is whe 一题英语选择题.懂英语的进.1.Listen!One of the boys ___ to others.A are speaking B are telling C is speaking D is telling 1、我们所学的电学里面有很多数据必须要明白.下面是小红小组同学通过社会实践活动获得的一些数据.请你帮小红她们判断下列哪些数据是最接近实际情况的.（ ）A、通过普通白炽灯泡的电 安装照明电路时,为检测电路是否正确,在接通电源钱将火线上的保险丝换成一白炽灯泡,同时断开所有用电器开关,接通电源后发现灯泡正常发光,由此判断（）A.安装正确B.安装不正确,某处短路 1、用放大镜看自己的指纹,当手指到放大镜的距离为10cm时,能看到清晰放大的指纹,放大镜焦距一定（）A、大于10cm B、小于10 cm C、大于20cm D、小于5cm2、用幻灯机放映幻灯时,下面正确的说法是 小明搬新房,在测量窗户玻璃的长度和测量窗帘的长度时应分别选用分度值是多少的刻度尺（ ） A cm,dm B mm,cm C um,mm D mm,m 两个直径有微小差别且平行的滚柱之间距离t,夹在2块平晶中间形成劈尖.当单色光垂直如射,产生等厚干涉条纹,若如射光波长变短,则在t范围内干涉条纹A.数目增加、间距变短B.数目减少、间距 1.-How did he get back last night?- I think he ____ back on foot,as there were no buses or taxies then at all.A.might have come B.needn't have comeC.must have come D.should have come2.The doctor said I was over-weight.If only I ___ less!A.ate B.have 求这三道选择题答案 第三道选择题 帮我看看吧1.What do you think _____ told you?A he has B has he C about he has D that he has 2.We are often embarrassedd that in the last few decades,few movies and TV plays _____ for the education of children.A intended B were intended C have in 选择题三道 三道选择题,求答案.急,拜托了 求2010年江苏省13市语文试卷对不起，忘说明是中考试卷了 求2010江苏学业水平测试化学的几道选择题答案.我快要不过了,有几题不确定,15,16,17,23.原题如下：13.配置一定物质的量浓度的 溶液,下列操作正确的是A.称量时,将 固体直接放在托盘天平的右盘