【单选题】将一个大小为200G的视频文件,采用压缩比率为100:1标准压缩后,其容量为( )GB。
【单选题】— How long ____ you ____ in the country with your grandparents, Henry? — About four weeks. I'll return as soon as school starts. [ ]
【判断题】偏好的改变导致人们的需求在某调需求曲线上向上或向下移动,而收入的变动则引起需求曲线的移动。
【简答题】将0.3mol NaCl固体与0.1mol CuSO 4 ·5H 2 O固体混合溶于水,配成1升混合液。然后取出200ml溶液,用石墨电极,通电一段时间(不考虑水解)。求Cl - 正好全部变为氯气逸出时,阴极上产生的气体体积(标准状况下)是多少?所得溶液的PH为多少(假设溶液体积不变)?
【单选题】I ______ the CDs to you if I have time tomorrow. [ ]
【简答题】将0.3mol NaCl固体与0.1mol CuSO 4 ?5H 2 O固体混合溶于水,配成1000mL混合液.然后取出200ml溶液,用石墨作电极,通电一段时间.电解过程分为三个阶段试回答: (1)其中第一阶段发生的电解反应的离子方程式为______. (2)电解的最后一个阶段,阴极上发生的电极反应式变为______. (3)若Cl - 正好全部变为氯气逸出时,阴极上产生气体的体积______L...
【单选题】—Have you got any books on English grammar? I’d like to borrow . —Yes, here you are.But you must return it by Friday.
【简答题】一When did you learn the news that Obama made a trip to Canada as President? 一_______ was on my return. A.That B.It C.There D.This
【简答题】You type a word or phrase into an Internet search engine such as Google or Yahoo, hit return and in an instant, dozens of "hits" -Web sites containing words that match your query-appear on the compute...
【简答题】6分)将0.3mol NaCl固体与0.1mol CuSO 4 ?5H 2 O固体混合溶于水,配成1升混合液。然后取出200ml溶液,用石墨电极,通电一段时间(不考虑水解)。求Cl - 正好全部变为氯气逸出时,阴极上产生的气体体积(标准状况下)是多少?所得溶液的PH为多少(假设溶液体积不变)?