初中数学教师考试难吗

关于第二宇宙速度的疑问当½mv²=(MmG)/R时,为第二宇宙速度,但是(mv²)/R=(MmG)/R²,mv²=(MmG)/R,½mv²=(MmG)/(2R),则(MmG)/R=(MmG)/(2R),是不是很矛盾,还是不能用公式(mv²)/R=(MmG)/R²? 翻译"obama's "sworn in " makes it official that he is now the president " 英语翻译 The president has started using loThe president has started using look-alikes during some public appearances．Dave is offered a chance to “serve his country” by becoming one．However, things go wrong．The President becomes very il the man who murdered the president 怎么翻译 这是个什么句型? THE PRESIDENT怎么样 左边一个黑右边一个卖组成是什么字 左边一个去右边一个来组成一个什么字? y=√x+2005 + √2005-x +x ,求y的算术平方根 Use these words to make sentences（连词成句）内容：like,for,Chinese,new,I,red,clothes,New Year's Arrange these words to make sentencesopen/the cinemas/remained/all weekthe traffic/the policeman/moving/gotan old friend/the other day/came across/she use these prompts to make if + will sentences1.Sales / (not) improve / (not) make / profit2.profits high / we / get / pay increase3.I / lower price / you / pay / cash4.you / take 10,000 / we / give / you / discount5.we / give / you / 60 day’s credi [速采抢答-最先答对3-5分钟完成采纳]房间有10根蜡烛.被风吹灭9根.还剩多少根? 已知某动点在时刻t的速度为v=6t-2,当t=0时,位移S=5,求此动点的运动 有一机器人的运动方程为s=t^2+3/t(t是时间,s是位移),则该机器人在t=2时刻的瞬间速度是 英语翻译In a series of decisions,the National People's Congress in Beijing has also overruled judgments of Hong Kong's Court of Final Appeal by issuing tortuous reinterpretations of the territory's mini-constitution,the Basic Law. zhe communist party of china closed its 17th national congressThe Communist Party of China (CPC) closed its 17th National Congress on Sunday,endorsing the incorporation of the scientific outlook on development into the Party Constitution and installi 英语翻译查到以下几个解释：1）全国房地产/不动产经济人协会（直译）2）全国不动产开发商协会3）全国房地产仲介协会哪个正确,为什么?不懂勿答.1）经纪有没有知道的啊？请说明一下原 the Standing Committee of the National People's Congress 是什么机关 翻译the emergency of a national culture 一物体做变速直线运动,在时刻t瞬时速度v（t）=2t—1,则从t=0到t=2这段时间内该物体的位移是?本人在这方面知识欠缺. make the sentences with the follings1is,as we all know,for,china,famous,her,long history2as,he not,tall,as,is,his brother3as if,Jack,was,thirsty,drank,three glasses of,he,very,waer4stayed,instead of,at home,going sailing,the little girl5boys,forexamp make sentences with the given vmake sentences with the given verbs in brackeets是什么意思? Make up sentences with the giveb words.1.steet,left,the,on,down,library,the,is,the2.office,new,is,post,the,where3.way,thll,me,to,you,hotel,the,let,the,new4.of,the,in,the,school,pay,front,is,phone 标准状况下,22.4L Cl2和HCl的混合气体中含分子总数为多少 在标准状况下,1molNH3与HCl的混合气体（1:1）,体积约是22.4L这句话为什么不对呢 【科学选择题】下列反应中,属于中和反应的是()A.Mg+HCl下列反应中,属于中和反应的是()A.Mg+2HClB.CuO+H2SO4C.Cu（OH）2+H2SO4D.CuO+H2中和反应的实质是酸溶液中的（）离子和碱中的（）离子相结合生成 解方程 2.2x-0.86=2 7.2x=0.44=17 4×9-0.5x=31.5 某质点的位移随时间的变化规律的关系是：s=4t+2乘以t的平方 ,s与t的单位分别为米和秒,由于位移随时间的变化规律的关系是：s=4*t+2*t*t 故速度随时间的变化规律的关系是：v=ds/dt=4+4*t 故质点 某质点的位移随时间变化的关系为S=4T+2T平方,S与T的单位分别为M和S,则质点的初速度和加速度分别为多少 某质点的位移随时间的变化规律是X=4t+2t^2,x与t的单位分别为m和s, 做直线运动的某质点的位移随时间变化的关系为x=4t+2t²,x与t的单位分别是m和s,则质点的初速度与加速度分别是（）A.4m/s；2m/s²B.0；4m/s²C.4m/s；4m/s²D.4m/s；0 为什么雷雨天里会先看到闪电才会听到雷声?在雷雨天里.我们总是先看到闪电在听到雷声,这是为什么呢?