由CO、H2和O2组成的混和气体60mL,在一定条件下恰好完全反应,测得生成物在

题型:选择题

问题:

由CO、H2和O2组成的混和气体60mL,在一定条件下恰好完全反应,测得生成物在101kPa120℃下对空气的相对密度为1.293,则原混和气体中H2所占的体积分数为 [ ]

A.1/6

B.2/3

C.1/4

D.1/3

考点:金属、非金属的有关计算
题型:选择题

阅读理解。    

     I have a very good English teacher.My classmates and I all like her very much. She is very friendly to

us. We all like to have English classes very much.  She is tall and beautiful.   She looks like a middle

school student.    She has big eyes, a small mouth and long black hair.    She oftenWears a yellow coat

and black trousers.  Her name is Wang Yanjun.We often call her Miss Wang. She teaches English very

well. Inclass, she looks like our sister.She often helps us to solve (解决) problems. After class, she looks

like our friend. We often play games together.  This is my English teacher. I love her and believe my

Eng-lish will be better and better.

1. We like _____very much. 

A. Chinese classes          

B. English classes            

C. math classes

2. The teacher's name is_____.            

A. Wang Yanjun              

B. Wang Yangjun              

C. Miss Yanjun

3. The teacher looks like a _____ student. 

A. primary school            

B. middle school            

C. university(大学)      

4. Miss Wang often wears a _____ and _____.          

A. red coat, white trousers          

B. black coat, yellow trousers          

C. yellow coat, black trousers

5. I believe my English will be _____ and _____.        

A. better, better            

B. good, good              

C. best, best

题型:选择题

如图所示电路中,电源电压保持不变,R1=6Ω, R2=12Ω,求:

(1)闭合S1,断开S2,电压表示数为3V,则电源电压为多大?

(2)闭合S2,断开S1,电压表示数为6V,小灯泡恰好正常发光,则小灯泡的额定功率为多大?  

题型:选择题

音像档案

题型:选择题

我国境内的所有在个体工商户打工的人员,均有依照《工伤保险条例》的规定享受工伤保险待遇的权利。

题型:选择题

骨盆的形态、大小和发育与哪项因素无关

A.性激素

B.种族

C.营养

D.遗传

E.外伤

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