题目内容
（请给出正确答案）
[单选题]
反应2SO2+O2⇋2SO3，5s内SO3的浓度增加了0.4mol/L，则在这段时间内用O2表示的反应速率（mol/L·s）为（）
A.0.1
B.0.08
C.0.04
D.0
答案
C、0.04
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
答案
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.0.1
B.0.08
C.0.04
D.0
答案
C、0.04
如果结果不匹配，请 联系老师 获取答案
更多“反应2SO2+O2⇋2SO3，5s内SO3的浓度增加了0.4…”相关的问题
A.开始时正反应速率大于逆反应速率
B.平衡时正、逆反应速率相等
C.平衡时正、逆反应速率都为零
D.平衡时 SO 2的转化率小于 100%
Dr. James A. Naismith, the father of basketball, was an instructor at a YMCA(基督教) Training school. The school trained people to work in YMCAs. Officials at the school were concerned about the low attendance during the winter months. They felt that people didn't attend then because the school did not have a good winter sports program. So they asked Dr. Naismith for help. He came up with a new indoor game.
Naismith studied current games. He found that all the most popular games used a ball. So a ball would be a part of his new game, he decided. But kicking the ball or hitting it would be too rough for indoor. So he put 2 peach baskets up on poles. The players had to try to throw a soccer ball into them. Naismith then made thirteen rules for the game. 12 of them are still in use today. Just 7 years after the game began, professional basketball teams were formed.
And that's how basketball was born.
Which of the following would be the best title for the passage？
A．The Birth of Basketball
B．YMCA and Basketball
C．Basketball——an Indoor Game
D．A Winter Sports Program
A.not so good as all the plays
B.not so good as any other player' s
C.not good as the players
D.not good as that of any player' s
It's really kind ______
A．of you to say so
B．for you to say so
C．of you saying so
D．for you saying so
A.like B.in C.around D.to E.toward
When it comes _____1 gravity,the larger an object is,the stronger its force is.A person creates gravity but not enough to pull objects ____2 him or cause things to go into orbit ___3 him.On the other hand,a planet has enough gravity to pull objects into orbit around it.A star makes enough gravity that it can pull whole solar systems into its orbit,____4 ours.Our sun's gravity is so strong that it keeps an object-Pluto-that is roughly 3.7 billion miles away____5 orbit.
A.s soon as
B.ven though
C.so that
根据以下材料回答第 1～5 题：
A．I will take it．
B．How much is it？
C．What can I do for you？
D．Which one do you like？
E．Let me help you．
F．How many ones do you want？
G．Here you are．
H．Thank you SO much!
(S=Shopkeeper。P＝Peter)
第 55 题
S： 1
P：1 wan to buy a notebook．
S：The notebooks are over there． 2
P：The blue one looks nice． 3
S：Two yuan．
P：That’s all right． 4
S： 5
P：Thank you．
