【单选题】用0.1mol/L盐酸溶液滴定0.16g纯Na2CO3(M=106g/mol)至甲基橙变色为终点,约需HCl溶液
【单选题】Sarah is a girl of high _____________, so we never made fun of her shortcomings.
【简答题】填入所缺字母或字母组合,使三个单词都含有相同的元音发音,并重新写出一个含有所填字母、发音也相同的单词。 1. c__lour c__me m__ney ____________ 2. h__me g__ __ver ____________ 3. b__ __k f__ __t g__ __d ____________ 4. g...
【简答题】Sarah is a keen walker. She lives in a big city. When she goes on holiday she likes to walk in the hills. She is looking for new places to go. Jane is keen on music. She also likes reading about the p...
【简答题】看图,填写句子所缺的单词(单词的第一个字母已给出)。 Look, this is my b . There is a closet n the door. B the door, there is a trash bin. In front of the shelf, there is a d . U the desk, there is a chair. On the wall, there i...
【单选题】用Na2CO3(M=106.0)标定0.1 mol·L-1HCl溶液时,欲使滴定所消耗HCl溶液的体积控制在25 mL左右,应称取Na2CO3的质量约为()
【简答题】Read and write. (根据文意思,填出单词中所缺少的字母) 1. 长的 ong 2. 小的 sm l 3. 长颈鹿 g r ffe 4. 兔子r bb t 5. 大的b g 6. 鸟 b rd
【单选题】水准测量的误差来源大致可分为仪器误差、观测误差和外界条件的影响三个部分。其中仪器误差中,影响最大的是( )。