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问题 选择题

50mL的酸式滴定管中盛有0.1mol/L的HCl溶液，溶液的凹液面最低点刻度为20.00mL。若将滴定管内的酸液全部放完，刚好中和锥形瓶内30.00mL的NaOH溶液，此碱液的浓度为

A．>0.1mol/L

B．<0.1mol/L

C．=0.1mol/L

D．不能确定

答案

答案：A

50mL的酸式滴定管中盛有0.1mol/L的HCl溶液，溶液的凹液面最低点刻度为20.00mL，由滴定管的构造可知，滴定管内盐酸的体积大于30mL，所以将滴定管内的酸液全部放完，刚好中和锥形瓶内30.00mL的NaOH溶液，此碱液的浓度大于0.1mol/L；

填空题

用所给单词的适当形式填空（每空1分，共5分）

grade      fail        great       get        because

Dear Dad ,

The day before yesterday was Father’s Day .I couldn’t celebrate it for you because I was busy taking the high entrance exam . But I have said “I love you, Dad !” in my heart many times .

You are an ordinary (普通的) man ,but in my eyes, you are the小题1:father in the world . Every time I have trouble, you always give me advice and help me out. I remember once I小题2:in a competition ,and I felt very upset . Instead of complaining, you just said to me quietly, “It doesn’t matter . A real man must learn to face many failures (失败) in life bravely .Cheer up !”

Dad,I am not going to buy you anything as a present小题3:I don’t think it express my thanks to you .I’ll try my best to get good小题4:.I think that is the best present you are looking forward to小题5:. I’m sure I won’t let you down .

Hope my dear dad is healthy forever.
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填空题

一面两销组合定位中，为避免两销定位时出现（）干涉现象，实际应用中将其中之一做成（）结构。
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