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【单选题】
Everyone knows how the story of Cinderella ends, but did you ever really think about how she spent her days before she met the prince? Her daily routine was not fascinating. She did everything from sweeping the floor to cooking the meals. If someone had asked Cinderella, 'Are there any kinds of household work that you particularly hate?' She probably would have answered, 'Why, none, of course. Housework is my duty!' In the real world, however, most people have definite dislikes for certain sorts of household work. Two of these tasks are ironing clothes and washing dishes. Ironing clothes is most hated because it is not a task that can be completed quickly or thoughtlessly. Each piece of clothing must be handled individually, so ironing a basket of laundry can take hours! After ironing a piece of clothing with great caution, which requires smoothing out the fabric, and following the seams, you need to place it on a hanger as soon as possible. If you do not follow these directions carefully, it might become wrinkled and you have to start over. Perhaps that is why ironing is not a favorite thing to do. It calls for extreme attention to detail from beginning to end. Another household job that many people dislike is washing dishes. Of course, some people claim that this work is no longer a problem because we have dishwashers now! How-ever, no one would argue that dishes, silverware, and especially pots and pans washed in a dishwasher don't come out as clean as they do when washed by hand. For this reason, many of us continue to wash our dishes by hand, but we are not necessarily happy doing it. Cleaning dishes is a job that not only takes a lot of energy but also requires the patience to wash and dry them. In addition, unlike ironing clothes, washing dishes is a thing that usually must be done every day. I don't know how Cinderella felt about this particular task, but I believe that most people hate it as much as I do. For Cinderella, doing household work is______.
A.
an assignment
B.
a compulsion
C.
an obligation
D.
a burden
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【单选题】间接碘量法的滴定反应为 :2Na 2 S 2 O 3 + I 2 ↔ Na 2 S 4 O 6 +2Na I ,下列说法中错误的是( )。
A.
应在弱酸性条件下进行滴定
B.
滴定的突跃范围与浓度无关
C.
指示剂应在临近终点时才加入
D.
溶液中应有过量的KI
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【单选题】间接碘量法的滴定反应为:2Na2S2O3+I2 Na2S4O6+2NaI,下列说法中错误的是( )。
A.
应在弱酸性条件下进行滴定
B.
定的突跃范围与浓度无关
C.
指示剂应在临近终点时才加入
D.
溶液中应有过量的KI
【单选题】试剂硫酸铜的含量可以采用碘量法测定,因为在酸性条件下2CuSO 4 +4KI=2CuI+I2+K2SO 4 ,而硝酸铜却采用配位滴定法测定含量,因为()。
A.
硝酸是氧化剂
B.
配位滴定法准确度高
C.
配位滴定法指示剂变色敏锐
D.
配位滴定法干扰离子少
【单选题】间接碘量法的滴定反应为:2Na2S2O3+I2=Na2S04+2NaI,下列说法中错误的是()
A.
应在弱酸性条件下进行滴定
B.
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C.
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D.
溶液中应有过量的KI
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B.
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1.
D.
None.
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A.
易操作
B.
针对性强
C.
经济高效
D.
有利于教师作用的发挥
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