为什么叫调和平均数

这句话里的bear是哪个意思?The pedestal cost $270000,which was borne by contributions of various American associations,groups and individuals.我查了下bear的意思有好多好多了,但是不知道这里用的是哪个意思, 制氧气时排水法收集氧气后出现倒吸现象,立即松开试管上的橡皮塞为什么这句话是对的?这样做不是会导致空气进入集气瓶,使制得的氧气不纯吗? etiquette differences in china and western 以analysis of Chinese and Western dining differences 为议题写篇论文.头大 求高手帮助 bear什么意思 bear是啥意思 bear是什么意思急 bear的意思 (1/3)在对人体吸入的空气和呼出的气体进行实验探究的过程中,向一瓶空气和一瓶呼出气体中个滴入少量澄...(1/3)在对人体吸入的空气和呼出的气体进行实验探究的过程中,向一瓶空气和一瓶呼 I am going to take some book with me这句话哪里错了,要怎么改呀? I am going to my some comic book 的问句 I'm going to take some book with me.订正 are you going to buy some book this afternoon其中哪一个是错的are you going to buy some book this afternoonA B C D Girls like going (shop) with friends but boys like to piay games 用shop的适当形式填空. 英语:western的W到底要不要大写,我看题目上有的大写有的不大写 搞糊涂了…… i like ___ sports with my friends.应该填怎么类的词？ western前有the 要大写吗 the Western people对吗? 文章是Dear Sir,I'm a student in Grade Seven.I like our school newspaper ,School Times,very much.I like___(read)it with my friends.I think School News.这题该写什么呢?可是,也有like to do sth i like goingsightseeing with my friends的同义句 1.We hope_____a good time.A.he has B.him to have C.him has D.he have 暑假sunmmer holiday 要不要大写 Eastern holiday and Western holiday怎么理解?在为今晚英语角题目苦恼中……Eastern holiday and Western holiday这个holiday是vacation还是festival的意思?顺便能给意见怎么说 Western holiday是什么意思还有special什么意思?This isSanta.Who is he? He is a merry man in red colothes.Christmas. Christmas songs are carols.这句话什么意思? 填关系代词或副词,I would like to live in a house_living room has a lot of sunlightAndrew is the only one of the students_can speak English and FrenchIlove the place_i was bornI have told you all_i knowIt was a sunny day_we went to the Great W 什么是中位数,众位数,平均数 Today is Open Day.(用tomorrow改写) Tomorrow_______ ________ Open Day. Tomorrow is our_______(move) day_______(refrigerate) trucks are very useful 采气体只能用排水法收集,请你据此推测该气体的性质:一定具有的/可能具有的该气体一定具有的化学性质是什么一定具有的物理性质是什么可能具有的化学性质是什么可能具有的物理性质是 western countries在句子中是大写还是小写western countries culture 这两个词在句子中的时候w是大写还是小写,注意是在句子中,不是在句首. 如何比较两组数据的中位数,平均数,众数(只有中位数相等) my home town江苏 upvc cpvc pvdf管的析出物对比图