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问题 单项选择题

患者，女，28岁，查体：肝浊音界向上移位，该患者不可能是

A．右肺纤维化

B．右下肺不张

C．鼓肠

D．气腹

E．右侧气胸

答案

参考答案：E

补全对话，情景问答
用方框中所给句子完成对话
A.All right
B. Shall I cut some bread?
C. That's a good idea.
D. Is there anything else you would like me to do?
E. Would you like me to wash the salad?
A: Shall we go for a picnic this Sunday?
B:   1  
A: Let's go to the South Lake Park.
B:   2   We must prepare some food.
A: Yes. We can buy some chicken,sausages and somefruit.              
A: I have to get lunch.
B: Can I help?
A: Yes,that would be nice.
B:   3  
A:Yes, please. That would be a help.
B:   4  
A:No,there's no need,thanks.l've already done it.
B:   5  
A: Well,you could lay the table.
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填空题

（10分）在一定温度下，醋酸溶液存在电离平衡：

CH3COOH   CH3COO- + H+

(1）某温度时，0.1mol/L的醋酸溶液中的c(H+) 与0.01mol/L c(H+)的比值   _________________（填“大于”、“小于”或“等于”）10

（2）已知：25℃时，该电离平衡的平衡常数为1.75×10-5

①求该温度时，amol/L的醋酸溶液中c1(H+)="________________mol/L" (用含a的代数式表示)。[提示：此时a比较小，进行简化计算，平衡时c(CH3COOH)可用初始浓度代替，水电离出的c(H+) 、c(OH-)忽略不计，下同]

②若该温度时向该溶液中加入一定量的CH3COONH4(假设溶液体积不变)，使溶液中c(CH3COO-)为bmol/L，则此时c2(H+)=________________mol/L（用含a、b的代数式表示）.

③c1(H+)__________  c2(H+)（填“大于”、“小于”或“等于”）
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