碳化塔下部堵塞较常发生在(),结疤以()为主。A、水箱段靠近塔底,NaHCO3 B、

题型:单项选择题

问题:

碳化塔下部堵塞较常发生在(),结疤以()为主。

A、水箱段靠近塔底,NaHCO3

B、笠帽盖底部,NaHCO3

C、水箱段靠近塔底,NH4HCO3

D、笠帽盖底部,NH4HCO3

考点:纯碱生产工纯碱碳化工纯碱碳化工题库
题型:单项选择题

下面哪个数低于1/3()

A.22/63

B.4/11

C.15/46

D.33/98

题型:单项选择题

阅读理解。

     February 11th is the birthday of the most famous American inventor, Thomas Alva Edison.

Edison was born in 1847. He was not a good student when he was a young boy. His teacher said

he was one of the most dumb headed(笨头笨脑的)students. He did badly in many subjects and

left school after only three months. So his mother took him home and taught him herself. Edison

didn't like school at all, but he loved science. He liked to ask questions.

     One day his father found him sitting on some eggs. His father asked him why. The boy didn't

answer. He asked his father instead, "Why can't I hatch(孵化)chickens, but hens can?"

     Edison invented 1328 things in his life, and these things made our lives more comfortable(舒适的)

and the world more beautiful. People will never forget him.

1. Edison was born _____.

A. in winter

B. one hundred years ago

C. in Canada

D. in January 

2. Edison's teacher said _____.

A. he was one of the cleverest boys

B. he was a good student

C. he was not a good student

D. he could learn many things

3. Edison's mother _____.

A. taught him at home

B. taught him at school

C. was a teacher

D. took him to another school

4. One day Edison sat on some eggs. He _____.

A. liked to sit there

B. wanted to break the eggs

C. wanted his father to look for him

D. wanted to hatch chickens

5. We now know Edison _____.

A. was a good student

B. was a dumb headed student

C. was very clever

D. wasn't famous

题型:单项选择题

黑孩、菊子、小石匠等人物形象出现在()。

A.《哦,香雪》中

B.《受戒》中

C.《在山区收购站》中

D.《透明的红萝卜》中

题型:单项选择题

一位历史学家在评价20世纪初的欧洲形势时说:“欧洲已经变成一只‘火药桶’,只需一粒火星将它引爆。”这里的“火药桶”和“火星”是指()

A.巴尔干——萨拉热窝事件

B.意大利——萨拉热窝事件

C.德国——慕尼黑阴谋

D.苏台德区——慕尼黑阴谋

题型:单项选择题

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