某密闭容器中充入等物质的量的气体A和B，在一定压强和温度下发生_爱下问搜题

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问题选择题

某密闭容器中充入等物质的量的气体A和B，在一定压强和温度下发生反应：A(g)＋xB(g)?2C(g)，达到平衡后，只改变反应的一个条件，测得容器中物质的浓度、反应速率随时间的变化如下图所示。下列说法中正确的是(　　)

A．30 min时降低温度，40 min时升高温度

B． 0～8 min内A的平均反应速率为0.08 mol·L^－1·min^－1

C．反应方程式中的x＝1，正反应为吸热反应

D． 54 min时C的体积分数大于40 min时

答案

答案：B

本题考查化学平衡图像问题；由图像可知，30min时只有反应速率降低了,反应物与生成物的浓度瞬时降低，反应仍处于平衡状态，故不能是温度变化，而是降低了压强，A项错误；由图像可知，反应从开始到8min内浓度减少了0.64mol/L，故A的反应速率为0.08 mol/（L·min），B项正确；由开始到达到平衡，A、B的浓度减少的量相同，由此可知X=1,由图像可知，升高温度，平衡向逆向进行，故正反应为放热反应，C项错误； 40min时平衡向逆向移动，故54min时C的体积分数小于40min时的体积分数，D项错误。故本题选B。

问答题简答题

流式细胞仪操作技术的质量控制主要涉及哪几个方面？

完形填空

完形填空（共20小题；每小题2分，满分40分）
At the age of 13, I was angry and rebellious(叛逆的)，with little regard for anything my parents had to say, 1 if it had to do with me. 2 so many teenagers, I struggled to escape from anything that didn’t 3 my picture of the world. A “brilliant without need of guidance” kid, I 4 any open offering of love. In fact, I got 5 at the mention of the word love.
One night, after a particularly 6 day, I stormed into my room, shut the door and got into bed. 7 I lay down in the privacy of my bed, my hands slipped under my pillow. There was a(n) 8 . I pulled it out and on the envelope it 9 “To read when you’re 10 ”.
Since I was alone, no one would know whether I read it or not, so I 11 it. It said: “Mike, I know life is hard right now, I know you are frustrated and I know we don’t do everything right. I also know that I love you completely and 12 you do or say will ever change that. I am here 13 you if you ever need to talk, and if you don’t, that’s 14 . Just know that 15 where you go or what you do in your life, I will always love you and be proud that you are my son. Love, Mom.”
That was the 16 of several “To read when you’re alone” letters. They were 17 mentioned until I was an adult. In the midst of my turbulent(不安分的)teen years, the letters were the calm assurance that I could be 18 in spite of my rebelliousness. Just before I fell asleep I thanked God that my mom knew what I, an angry teenager, 19 . Today when the seas of life get stormy, I know that just under my 20 there is that calm assurance that love — consistent, enduring, unconditional love — changes lives.

B．particularly

D．appreciated

D．disappointing