如图所示,常温常压下气体X(见选项)与O2等物质的量混合后充满圆底烧瓶,挤压胶头

题型:选择题

问题:

如图所示,常温常压下气体X(见选项)与O2等物质的量混合后充满圆底烧瓶,挤压胶头滴管并打开止水夹,可观察到烧杯中的水沿导管进入烧瓶。长时间充分反应后,烧瓶中所得溶液的物质的量浓度最小的是(假设溶质不向烧瓶外扩散)

A.NH3

B.HCl

C.SO2

D.NO2(假设不含N2O4

考点:物质的量
题型:选择题

Some students think it difficult to learn English well. That’s because they don’t find the right way. I think reading is very important for students. The more you read, the better you’ll understand.

Reading is helpful to listening, speaking and writing. If you often read English aloud, you’ll improve your listening. On the other hand, listening a lot can help you to read better. Reading English everywhere when you are free, if you wish. You can get a lot of knowledge when you read. Sometimes you need to express your ideas, you can either speak or write. That means you are using what you learned from reading. The same as Chinese, the more you read, the better you can write. If you want to remember something, you should read again and again.

So from now on, you’d better do more reading. It’s a good way to learn English well.

小题1: Some students think it difficult to learn English well because _________.

A.they don’t work hard

B.they are afraid of English.

C.they don’t find the right way

D.they aren’t clever小题2: Reading is helpful to ________.

A. speaking            B. listening            C. writing           D. A. B & C

小题3:The writer thinks ________ is a good way to learn English well.

A.the better you write

B.doing more reading

C.the more you remember

D.the more you write小题4: In Chinese studying, the more you read , _________.

A.the better you speak

B.the better you write

C.the more you remember

D.the more you write小题5: The title of this passage may be _________.

A.English is important

B.Reading is helpful

C.English is difficult

D.Reading is important

题型:选择题

Eight times eight ____ sixty - four.

A.is

B.are

C.get

D.equal

题型:选择题

气化

题型:选择题

下列哪种甲状腺疾病不宜手术()

A.甲亢

B.甲状腺腺瘤

C.桥本病

D.甲状腺 * * 状腺癌

E.结节性甲状腺肿

题型:选择题

上级及技术部门明令规定禁止使用的配件、材料,严禁()。

更多题库