问题
选择题
常温下，Ksp（CaSO4）=9×10-6，常温下CaSO4在水中的沉淀溶解平衡曲线见图。下列说法正确的是
A．CaSO4在稀硫酸中的溶解性比在纯水中的溶解性大
B．a点对应的Ksp等于c点对应的Ksp
C．b点将有沉淀生成，平衡后溶液中c(SO42-)一定等于3×10-3 mol/L
D．d点溶液通过蒸发可以变到c点
答案
Ｂ
搜题请搜索小程序“爱下问搜题”
常温下，Ksp（CaSO4）=9×10-6，常温下CaSO4在水中的沉淀溶解平衡曲线见图。下列说法正确的是
A．CaSO4在稀硫酸中的溶解性比在纯水中的溶解性大
B．a点对应的Ksp等于c点对应的Ksp
C．b点将有沉淀生成，平衡后溶液中c(SO42-)一定等于3×10-3 mol/L
D．d点溶液通过蒸发可以变到c点
Ｂ
| 完形填空。 | ||||
| The best woman in the world is my mother; the sweetest sound in the world is mum's voice. Every day when I get back home from school. I see my mother 1 in the kitchen, tired but happy. I really want to give her a hug. Mother often says "parents want 2 from their kids. The only thing they hope to do is that their kids have a happy life." My mother is 3 my classmates' mother. When she gave birth to me, she was nearly 42 years old. When I become a university student, my mother will be 60 years old. My mother has been 4 for a long time. She suffers from a very serious illness. Maybe she will never fully recover (痊愈). 5 she still works hard for me every day. I want to help her, but don't know 6 I can do or where I can start. Each time my mother can't 7 from her sick bed, I feel afraid and don't want to go to school. But my mother always says to me 8 ," you must go to school. I can look after myself." Hearing this, I wonder 9 I am a good son, the only thing I can do is to give her a warm hug after school. Let's 10 more love and care to our mothers and let them know their kids really love them. | ||||
|