问题 填空题

一个塑料桶最多能装10.8kg的煤油,煤油的密度为0.8×103kg/m3,则用这个桶最多能装水______kg.

答案

∵ρ=

m
V

∴塑料桶最多能装煤油的体积:

V煤油=

m煤油
ρ煤油
=
10.8kg
0.8×103kg/m3
=1.35×10-2m3

塑料桶的容积:

V=V煤油=1.35×10-2m3

装满水水的体积:

V=V=1.35×10-2m3

最多装水水的质量:

mV=1×103kg/m3×1.35×10-2m3=13.5kg.

故答案为:13.5.

阅读理解

阅读理解。

     Almost everyone likes to eat apples. Apples trees grow in nearly every part of the world. The United States

produces (出产) more apples than any other country except (除……外) France. The states of Washington and New York grow the most apples.   

     Apples are red, yellow or green. They are very popular in the United States. Many people like to carry

apples to work or to school to eat with their lunches. Most American people are often too busy or too tired to

cook dinner, so they often have their dinners very simply (简单地). Apple juice is also a popular drink and

apple pie is the favorite dessert for many Americans.   

     The state of Washington is proud (骄傲) of its apples. The trees there produce about five billion apples

every year-nearly one apple for every man, woman and child in the whole world.

1. Almost everyone likes to eat ___________.                

A.     B.    C.   D.

2. ________ produces the most apples in the world.   

A. The United States    

B. Canada   

C. China    

D. France

3. Many Americans like to eat apples during lunch because they__________ at noon.   

A. eat nothing but apples    

B. feel it better to eat apples   

C. always eat simple food    

D. can get apples easily

4. "The trees there produce about five billion apples every year." One billion is_____.   

A. 100,000    

B. 1,000,000    

C. 10,000,000   

D. 1,000,000,000

5. The state of Washington is proud of its apples because they think ________.   

A. everyone in the world can share (分享) their happiness   

B. they can produce as many apples as people all over the world   

C. their apples are better than any of the other fruits   

D. their apple trees are the best in the world

单项选择题