可逆反应A(g)＋B(g) 2C(g)在固定容积的容器中进行，如果向容器中充入1_爱下问搜题

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问题选择题

可逆反应A(g)＋B(g) 2C(g)在固定容积的容器中进行，如果向容器中充入1molA和1mol B，在某温度下达到平衡时，C的体积分数为m%；若向容器中充入1molC，在同样的温度下达到平衡时，C的体积分数为n%，则m和n的关系正确的（）

A．m>n

B．m<n

C． m=n

D．无法比较

答案

答案：C

由于容器容积固定，但反应前后条件不变，所以只要满足A、B的物质的量之比不变，平衡就是等效的。1molC就相当于是0.5molA和0.5molB，此时A和B的物质的量之比还是1︰1，因此平衡是等效的，所以m＝n，答案选C。

单项选择题

女，20岁。乏力、食欲减退半年。骨髓象示增生明显活跃，红细胞系统明显增生，幼红细胞40%，细胞体积增大，染色质疏松，细胞质量丰富，细胞核发育落后于细胞质。最可能的病因是（）

A.溶血性贫血

B.巨幼细胞贫血

C.缺铁性贫血

D.急性失血性贫血

E.慢性再生障碍性贫血

完形填空

Whenever my kids have a party at school, I am the mom who always signs up to bring the juice boxes. It’s not because I’m   36  or that I don’t care if my kids have a good party. I am just not good at making homemade bread into holiday-themed shapes like other mothers.   37 , I’m happy to try, even though it’ll   38  me a long time to do it.
People say that housewives should have the   39  to make delicious meals, keep their houses clean, and   40  every minute of their child’s life. Their words used to   41  me a lot. I felt that I should also be able to do those things as a housewife. So   42  I couldn’t make the turkey-shaped cookies, I   43  feeling like a failure as a mom.
After many   44  attempts at baking, and many afternoons spent crying over my inabilities as a mother, I finally accepted the   45  that my lot(命运) in life is to be the juice box mom. I worked hard to be the   46  one in the elementary school. And after one of my daughter’s class parties, it   47 . Her teacher stopped me as I was leaving and said, “Thank you so much for always bringing   48  drinks. Sometimes parents forget that other children will also   49  class parties, and they end up being left out because we don’t have enough   50  for everyone.”
I just accepted her appreciation, rather than telling her that I brought extra drinks because I could   51  remember how many kids were in the class. But her   52  taught me an important lesson: I’m not a failure as a mom.
Not everyone is cut out to be a(n)   53  mom. I believe it’s okay to be the juice box mom. I may not bake cookies and decorate them beautifully, but I 54  something to drink. And I think that’s just as   55 .

C．insisted on

A．contribution

B．appreciation

C．congratulation

D．comprehension

C．interesting