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配置FeCl3时,向溶液里加入少量的Fe和稀盐酸.为什么这样做不行? 求英语作文一篇,题目talk about what the people in the picture are doing不用太长,根据题目意思是让写人物现在进行时,开头要引出有“图片（picture)" The changes about our country have brought many benefits in the past three years改错 急 The changes about our country have brought many benefits in the past three years改错 向氯化铁溶液中通入二氧化硫气体会生成什么?Thanks a lot 英语问题 同义句 1.There is nothing in the cardboard box. 2.He build camp with sticks.（要两句）同义句1.There is nothing in the cardboard box.2.He build camp with sticks.（要两句）动词填空1.It isnot polite （frig There is nothing in the box.(改为同义句)1.There is nothing in the box（改为同义句）There is _____ ______in the box.2.Sally is often late ____(介词) school.3.I have to go _____（介词）bed by 9:00 p.m.拜托了,答得好后面可以 there is nothing in the box（改成同义句）the box is_______________ Great changes_____(take) place in the past 30 years. Great changes___(take)place in HK in the past 10 years.RT. AB3是短周期两种元素形成的化合物,已知B原子比A原子多一个电子层,且AB3分子中所有原子满足8电子结构,则正确的是问题补充：A、AB3是三氧化硫B、A是ⅢA族元素C、B原子比A原子多10个电子D、B Great changes __________ in our country since 1978.(take place) 电子数为18的三原子化合物 for the past two years great changes（ ）in our town .（take）应该怎么填 现有A、B、C、D四种短周期非金属元素,他们的原子最外层电子数之和为19.在他们的化合物中,常见化合价均不止一种,但有一种相同的化合价.他们的一些物理常数如下：元素 A B C D原子半径/nm 0. 一根2寸水管接4个水龙头怎么接 需要 那些材料 She says "Last week I bought a bed变为间接引语She says __ __ a BEd the week before Lucy has bought many new clothes last week .Now she needs a larger__. (改错题）Last week she book? she bought the new house last month(同义句） point one's finger at someone take one's point什么意思 要悲伤的英文歌!听着想哭的歌.rt她要出国了,我该怎么办 there is nothing in the box ,_________?反义疑问 there is nothing in the box,_________?的翻译疑问句怎么写 there is nothing but a card in the box,( )there?应填is 还是isn't说明理由 1、The girl readed an interesting story last night.改错题 I read an interesting story ____a magazine last night.atoninunder Barry visited his uncle last week(对his uncle提问）（）（）Barry（）last week? 一质点自原点开始在x轴上运动,初速度大于0,加速度a大于0,当a值不断缩小直至为零时,质点的（ ） A速度不断减小,位移不断减小 B速度不断减小,位移继续增大 C速度不断增大,当a=0时达到最大, 家用调味品的种类有哪些 调味品食盐属于哪一类