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在下列各溶液中,离子一定能大量共存的是

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  • 【名词&注释】

    叶绿体(chloroplast)、单性结实(parthenocarpy)、控制中心(control center)、唐玄宗、细胞器(organelle)、实际上(actually)、节度使(military governor)、土地总面积(total land area)、次生韧皮部(secondary phloem)、看上去(look like)

  • [单选题]在下列各溶液中,离子一定能大量共存的是

  • A. 强碱性溶液中:K+、、Al3+、Cl-、SO2-4
    B. 含有0.1 mol·L-1 Fe3+的溶液中:K+、Mg2+、I-、NO-3
    C. 含有0.1 mol·L-1Ca2+的溶液中:Na+、K+、CO2-3、Cl-
    D. 室温下,Ph=1的溶液中:Na+、Fe3+、NO-3、SO2-4

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]下列各句中,加点的成语便用不恰当的一项是
  • A. 这名运动员看上去(look like)一副弱不胜衣的样子,实际上,他身体健,骨骼强健,耐力和速度非一般人可比。
    B. 在座的各位都是本领域的顶尖专家,我们请大家来,就是想听听各位的高见,大家不必客气.就姑妄言之吧。
    C. 他闲来无事,就经常上网发一些飞短流长的帖子,结果不仅弄得与同事邻里的关系很紧张,甚至还惹上了官司。
    D. 唐玄宗虽早就觉察到安禄山有反叛之心,但并没有及时除掉他,反而放虎归山,让他出任范阳节度使(military governor),这未免有点蹊跷。

  • [单选题]区别根和茎的次生结构应根据( )。
  • A. 初生韧皮部
    B. 初生木质部
    C. 次生韧皮部(secondary phloem)
    D. 次生木质部

  • [单选题]所谓无子果实就是经过单性结实产生的不含种子的果实。( )
  • A. 正确
    B. 错误

  • [单选题]皂荚的刺是变态的( )。
  • A. 根
    B. 茎
    C. 叶
    D. 表皮

  • [单选题]请认真阅读下列短文,从短文后各题所给的A、B、C、D四个选项中,选出最佳选项,A
  • A. When women sit together to watch a movie on TV, they usually talk simultaneously(同时的)about a variety of subjects, including children, men, careers and what' s happening in their lives. When groups of men and women watch a movie together, the men usually end up telling the women to shut up. Men can either talk or watch the screen -- they can' t do both -- and they don' t understand that women can. Besides, women consider that the point of all getting together is to have a good time and develop relationships -- not just to sit there like couch potatoes staring at the screen.
    B. During the ad breaks, a man often asks a woman to explain the plot and tell him where the relationship between the characters is going. He is unable, unlike women, to read the subtle body language signals that reveal how the characters are feeling emotionally. Since women originally spent their days with the other women and children in the group, they developed the ability to communicate successfully in order to maintain relationships. For a woman, speech continues to have such a clear purpose: to build relationships and make friends. For men, to talk is to relate the facts.
    C. Men see the telephone as a communication tool for sending facts and information to other people, but a woman sees it as a means of bonding.woman can spend two weeks on vacation with her girlfriend and, when she returns home, telephone the same girlfriend and talk for another two hours.
    D. There is no convincing evidence that social conditioning, the fact that girls' mothers talked them more, is the reason why girls talk more than boys. Psychiatrist Dr Michael Lewis, author of Social Behaviour and Language cquisition, conducted experiments that found mothers talked to and looked at, baby girls more often than baby boys. Scientific evidence shows parents respond to the brain bias of their children. Since a girl’s brain is better organized to send and receive speech,we therefore talk to them more. Consequently, mothers who try to talk to their sons are usually pointed to receive only short grunts in reply.
    E. 56. While watching TV with others, women Usually talk a lot because they
    F. . are afraid of awkward silence with their families and friends
    G. can both talk and watch the screen at the Same time
    H. think they can have a good time and develop relationships
    I. have to explain the plot and body language to their husbands

  • [单选题]
  • A. encouraged.
    B. comfortable
    C. proud.
    D. moved

  • [单选题]55_______-
  • A. at most
    B. for example
    C. in brief
    D. on purpose

  • [单选题]细胞内有细胞活动的“控制中心”之称的是( )。
  • A. 细胞器
    B. 细胞核
    C. 细胞质
    D. 叶绿体

  • [单选题]及时掌握土地利用现状是实现区域可持续发展的重要前提。安徽省土地总面积(total land area)中,各类土地比重约为:平原49.6%,山地15.3%,丘陵27.0%,水面8.1%。完成23~24题。23.调查全省土地利用现状快捷、高效的手段是
  • A. 遥感 B.地理信息系统
    B. 全球定位系统 D.数字地球

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