问题 问答题

一个只能装500克水的玻璃瓶,装满水后质量是750g,改装密度是0.8×103kg/m3的煤油,求:

(1)此玻璃瓶的容积是多少

(2)将该瓶中装满煤油后质量为多少.

答案

已知:m=500g,m=750g,ρ煤油=0.8×103kg/m3=0.8g/cm3,ρ=1.0g/cm3

求:(1)瓶子的容积V

(2)该瓶中装满煤油后质量m

(1)由ρ=

m
V
可得,瓶子的容积:

V=V=

m
ρ
=
500g
1.0g/cm3
=500cm3

瓶子的质量:

m=m-m=750g-500g=250g;

(2)该瓶中装满煤油,煤油的体积:

V煤油=V=100cm3

煤油的质量:

m煤油煤油V煤油=0.8g/cm3×500cm3=400g,

该瓶中装满煤油后质量:

m=m煤油+m=400g+250g=650g.

答:(1)此玻璃瓶的容积是500cm3

(2)将该瓶中装满煤油后质量为650g.

改错题

第二卷(非选择题)

第四部分:写作(共两节,满分35分)

第一节:短文改错(共10小题,每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Dear classmates ,          

Now I’d like to tell you why I learn English . I often        76.      

read English aloud and try learn something important by   77.      

hearts , which helps me remember it easily and form 78.      

the good habit of thinking in English . I listen to a lot and        79.      

talk with others in English . In this way , I was improved 80.      

my spoken English . I keep a diary in English every day but     81.      

my writing English is becoming better and better . I also try     82.      

my best to master the necessary grammar . With this means ,     83.      

I can express myself in English correct . That’s the way I   84.      

have been learning English . I hope it will be useful to you       85.      

That’s all . Thank you .

Yours ,

Wang Gang

单项选择题 A1型题