两种气态烃的混合物共2.24L(标准状况下),完全燃烧后得3.36L(标准状况下

题型:选择题

问题:

种气态烃的混合物共2.24L(标准状况下),完全燃烧后得3.36L(标准状况下)二氧化碳和2.7g的水。下列说法中,正确的是

A.混合气体中一定含有甲烷

B.混合气体中一定含有乙烯

C.混合气体中一定不含有乙炔

D.混合气体中一定含有乙烷

考点:烷烃的通性环烷烃(环己烷、环丙烷等)乙烯
题型:选择题

根据句意和首字母提示填空,完成下列句子。

1. He thought about going to Shanghai and Qingdao, but d____________ on Tibet.

2. He plans to have a very r____________ vacation.

3. Zhuxun says, "I just finished m____________ my last movie."

4. Many t____________ come to the Great Wall every year.

5. Your jeans are dirty. Go and wash them c___________.

6. I hope you are in good h____________.

7. There are h___________ of students in our school.

8. From the hill we can see the whole town b___________.

9. My s____________ habits are pretty good, I try to read, write and listen carefully.

10. He always helps his parents b___________ his brother.

题型:选择题

在抽样研究中,当样本含量逐渐增大时()

A.标准差逐渐增大

B.标准误逐渐增大

C.标准差趋向于0

D.标准差逐渐减小

E.标准误逐渐减小

题型:选择题

腹腔穿刺液中有大量中性粒细胞,革兰染色阳性球菌()

A.原发性腹膜炎

B.胃、十二指肠穿孔

C.阑尾炎穿孔

D.肝脾破裂

E.出血坏死性胰腺炎

题型:选择题

降膜式磺化器属于()反应器。

A.釜式

B.平推流

C.完全混合式

D.罐组式

题型:选择题

封油泵抽空的现象?危害?处理方法?

更多题库