往含0.2mol NaOH和0.1mol Ca(OH)2的溶液中持续稳定地通入C_爱下问搜题

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问题选择题

往含0.2mol NaOH和0.1mol Ca(OH)₂的溶液中持续稳定地通入CO₂气体，当通入气体为6.72L(S.T.P)时立即停止，则这一过程中，溶液中离子的物质的量和通入CO₂气体的体积关系正确的图像是(气体的溶解忽略不计)（）

A. B. C. D.

答案

答案：C

题目分析：先与0.1mol Ca(OH)₂反应生成Ca CO₃，消耗2.24L CO₂，再与0.2mol NaOH 反应生成Na₂CO₃，消耗2.24L CO₂_，再与0.1mol Na₂CO₃_，发生反应：Na₂CO₃+CO₂+H₂O="2NaH" CO₃_，消耗2.24L CO₂。选C。

完形填空

On April 11 Lincoln, Mrs Lincoln and two friends were spending night in talk, when Lincoln suddenly began to discuss his dreams. “I had one the other night. About 10 days ago I went to bed very 36 . I had been up   37  for important letters from the White House for a long time. I could not have been   38  in bed when I fell into sleep. I soon began to   39 . There seemed to be a dead silence about me. Then I heard sobs(抽泣)， 40  a number of people were weeping. I thought I left my bed and   41 downstairs. There the silence was broken by some pitiful(令人可怜的) sobbing, but the mourners(送葬者)were   42 .I went from room to room, no living person was in sight; but the same mournful sounds of distress(悲痛) met me as I   43 along. It was light in all the rooms; 44  was well known to me，but   45 were all the people who were sobbing as if their hearts would   46 ? I was puzzled and frightened. What could be the   47  of all this? I kept on walking until I arrived at the East Room, which I   48 . Before me was a dead body. Around it were soldiers who were acting as   49 ; there were some people   50  pitifully. ‘‘Who is dead in the White House?” I asked.
“The president，” was the answer.
“It’s   51 !”I said to myself and was surprised. How did he die?”
“He was killed by an assassinator (暗杀者)!” was the answer.
“ 52  came a loud burst of crying from the crowd，which woke me from my dream. I slept   53 that night, and although it was 54  a dream I have been rather angry about it   55 .”

A．out of sight

D．one mourner

B．at that time

单项选择题

教育事业产品属于（）。

A、纯公 * * 品

B、准公 * * 品

C、私人产品

D、企业产品