关于密度的物理题

She don't believeb me.中哪错了 蝴蝶u盘she's品牌 是限量版的吗这个 u盘 she does't like the movies为什么要加the Does she has a cell phone?哪里错了? 帮我写个漂亮的英文句子Half of the freshman year of life has ended, the next semester is about to start a new life. 把这句话写得漂亮些,急…… it would be very d___ for us to travel to space ,if w___ aren't astronauts . two hundred people died in the accident._____children.选哪个?为什么?A.many of them wereB.many of them areC.many of whom wereD.many whom were 设集合M={a,b,c},N={-1,0,1}若从集合M到N得映射满足f(a)>f(b)大于等于f(c),则映射f：M→N的个数是多少? 歌词里有 no way ---- my mind ,it's over 是什么歌 歌词里面有 it's over 设集合M={x|1 I ( ) have a bike.括号里为什么填do not不填not?我要原因!我也知道NOT不对.着急. he called at every door and___people the exciting news1 tells 2 tell 3 told 4 has told 说出选择的原因 宾语从句主语为第一人称时,若其后附加疑问句,附加疑问句的主谓语英语从句中的主谓语保持一这句话的意思感觉有点含糊, what's the wrong with you?有什么错误 哪一首歌有i thick i'll marry with you这句歌词 宾语从句中的谓语是否要和整句话（此宾语从句前的）谓语的时态保持一致?如：I think (that) I failed the exam. what's up?wha's wrong with you?相等吗 I have a new bike.中什么是主语,及物动词,宾语? 带有宾语从句时反意疑问句疑问部分的结构? why don't you visit our local teacher with us?的同义句是什么 宾语从句反意疑问句详细解答 气缸与推动的工作台速度相同吗 两气缸升降电路测试问题!陈师傅,您好!上次您给的电路图在测试过程中出现一点问题,有几点不解：(4个限位开关都用的磁性的）SQ2,SQ3一直处于接通状态（在气缸伸缩过程中）,不知道是否是 -Could you tell me ________?-He is an engineer.A.what he is B.what does he doC.who is he D.what he does我想知道你们选哪个?为什么?尤其要告诉我,为什么D不可以选? can you tell me who is he and can you tellme who he is 谁对 Spring,the sweet Spring,is the year's pleasant king. l play sports every morning (改为否定句)我英语不好 帮我下 Spring is the ( ) (1) season of the year.用说给的单词填空. 晚上好的英文写法 英语翻译 请问 晚上好英文怎么写? 要求油缸表面无肥皂泡产生 英语正确翻译