100ml 6mol/L H2SO4与过量铁粉反应,一定温度下,为了减缓反应进行

题型:选择题

问题:

100ml 6mol/L H2SO4与过量铁粉反应,一定温度下,为了减缓反应进行的速率,但又不影响生成氢气的总量,可向反应物中加入适量的(  )

A.Na2SO4(s)

B.NaOH

C.(NH4)2SO4(s)

D.CH3COONa溶液

考点:影响化学反应速率的因素
题型:选择题

阅读下面短文,  把A-D 四个句子填入文中空白处(1-4 ),使短文内容完整正确,然后完成第5 小题.。

     The best teacher I have ever had was my eighth grade math teacher, Mr. Herr. (1) ________

     Mr. Herr always came into the classroom with a smile. Each lesson of his  was  interesting  and  full  of

surprises. (2) __________ I think it was the first time I had really been made to  think  in  high  school.  I

had hated math, but he taught me to love it! He was good at talking and  I could  always understand  what

he was trying to teach.

     Mr. Herr was really young so he acted (行动) like us, and this made our learning fun. He also listened

to us and was always ready with a kind word. (3) __________ He made every student  easy  and  happy

in his class. We thought he was the one person who really understood us.

     (4) __________ He has moved to Switzer-land. The last thing I have ever got from him was a CD that he made for me. He is the best person and the best teacher I know. I will miss him for ever.

A. He would always do something funny to make us laugh.

B. He knew how to ask questions to make us think.

C. It was a great time to have been with Mr. Herr.

D. He was cool and he was a good painter.

5. From this passage, we can learn that ______.

A. with Mr. Herr's help, I began to love math

B. Mr. Herr taught me art when I was in Grade Eight

C. Mr. Herr couldn't get along well with his students

D. once Mr. Herr gave me an expensive bag

题型:选择题

给字母排队组单词。

1. g, o, a __________________

2. w, s, e, i __________________

3. s, r, a, t __________________

4. i, n, w, r, t, e __________________

5. y, b, a, b __________________

题型:选择题

男性,30岁,左小腿上段有一窦道,反复流脓,排碎骨块12年,近半个月发热,伤口红肿流脓,X线片显示:左胫骨上段增粗,见死骨,其周围有新生骨。

在应用抗生素的同时给予

A.死骨摘除

B.抗结核药物

C.切开引流

D.刮除植骨

E.穿刺抽脓

题型:选择题

传输层的______协议是一种面向无连接的协议,它不能提供可靠的数据包传输,没有差错检测功能。

题型:选择题

接收广州发的航行警告,气象警告和预报,BIB2为:()

A.Q/ABE

B.Q/ABCD

C.N/ABE

D.N/ABDEL

更多题库