试题与答案

某样品中可能含有碳酸钾、硝酸钾和硝酸钡三种中的一种或几种.现将13.8克样品加入

题型:选择题

题目:

某样品中可能含有碳酸钾、硝酸钾和硝酸钡三种中的一种或几种.现将13.8克样品加入足量的水,样品全部溶解,再加入过量氯化钙溶液,得到10克沉淀,对样品中的组成判断合理的是(  )

A.肯定没有硝酸钡,含有碳酸钾和硝酸钾

B.肯定没有碳酸钾,含有硝酸钾和硝酸钡

C.肯定不含硝酸钾和硝酸钡,只含有碳酸钾

D.肯定不含硝酸钾,含有碳酸钾和硝酸钡

答案:

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参考答案:A解析:影响井巷围岩稳定的因素很多,可以说题目中的ABCD选项几乎都和井巷围岩稳定有关,注意本题的要求是影响围岩稳定的主要因素,因此要从这许多因素中确定主要因素。《考试用书》中有许多地方都曾经...

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题型:完形填空

Ⅱ.完形填空 30分

Mrs White was a wealthy lady. She lived  16    in a large comfortable house where her children and grandchildren came to visit her frequently. However, she was   17   . She spent a lot of time thinking about her   18   and about her dead husband. Her children   19    about her and asked Dr. Green to see her.

Mrs Green was an experienced doctor. She knew old people became set in their ways and don’t like to be   20   what to do. She decided to get to know Mrs White before she said anything. During the visit, Dr. Green asked Mrs White to give her a    21   of the house. Mrs White was    22  her house and happily agreed. As they walked from room to room, Dr. Green    23    that there were a lot of violets(紫罗兰) in every window. She asked, “   24   do you have so many violets?” Mrs White replied, “I love these   25   and they   26    so fast that I have more and more.” When the tour of the house was over, Dr. Green said “I have one suggestion to make. Whenever you   27    a friend or a neighbor that is  28  in bed or getting married, give    29    one of your violets.”

Mrs White said    30    about the doctor’s advice and for a few months  31   the visit, she didn’t give away any of her violets. Then one day she was invited to the   32   of her neighbor’s daughter. She put a ribbon (丝带) on one of her potted plants and took it to the party. Later one of her friends was sick so she took a violet plants and took it to the hospital.   33   she began to give more and more of her potted violets to her neighbors. Over the years she    34    so many that she became known as the   35   lady.

16.A. well    B. alone    C. quietly    D. happily

17.A. cheerful   B. delighted    C. unhappy    D. disappointed

18.A. money   B. children   C. big house    D. old age

19.A. talked   B. thought   C. worried    D. learned

20.A. told    B. ordered    C. wanted   D. invited

21.A. tour    B. view     C. sight     D. picture

22.A. proud of   B. familiar with   C. interested in   D. anxious about

23.A. looked    B. showed     C. noticed     D. watched

24.A. How     B. Why     C. When     D. Where

25.A. rooms    B. windows    C. children    D. flowers

26.A. grow    B. make     C. become    D. produce

27.A. ask      B. get     C. hear      D. want

28.A. ill     B. sad     C. excited    D. pleased

29.A. it      B. me     C. you      D. them

30.A. nothing   B. anything   C. something   D. everything

31.A. before    B. after     C. during     D. until

32.A. lecture    B. graduation   C. celebration   D. wedding

33.A. Usually   B. Continuously   C. Gradually   D. Regularly

34.A. sold out   B. gave away   C. grew    D. kept on

35.A. old     B. violet    C. rich     D. famous

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