问题
填空题
一个表面积50平方厘米的圆柱体,底面积是15平方厘米,把2个这样的圆柱体拼成一个大圆柱体,这个大圆柱体的表面积是______平方厘米.
答案
圆柱的侧面积:
50-15×2,
=50-30,
=20(平方厘米);
大圆柱的表面积:50+20=70(平方厘米);
答:这个大圆柱的表面积是70平方厘米.
故答案为:70.
一个表面积50平方厘米的圆柱体,底面积是15平方厘米,把2个这样的圆柱体拼成一个大圆柱体,这个大圆柱体的表面积是______平方厘米.
圆柱的侧面积:
50-15×2,
=50-30,
=20(平方厘米);
大圆柱的表面积:50+20=70(平方厘米);
答:这个大圆柱的表面积是70平方厘米.
故答案为:70.
阅读理解。 | ||||
Children in England mustn't work until they are 13. They need to have a work permit (许可) to start working.
| ||||
1.In England how old do children have to be before they can work? | ||||
[ ] | ||||
A.15 B.14 C.10 D.13 | ||||
2.Paperboys and Papergirls deliver newspapers ______. | ||||
[ ] | ||||
A.early in the morning B.at noon C.in the afternoon D.in the evening | ||||
3.Teenagers in England can do all of the following except ______. | ||||
[ ] | ||||
A.work in an office B.work in a night club C.look after young children D.deliver newspapers | ||||
4.How many hours a week many teenagers work during the term time? | ||||
[ ] | ||||
A.10 B.14 C.17 D.20 |