问题
填空题
某印刷厂平均3名工人5分钟订60册书．要在1小时内装订1200册书，需要工人______名．
答案
5分钟=
小时，1 12
一名工人一小时订的册数是：
60÷3÷
，1 12
=240（册）；
所需的工人数是：
1200÷240÷1，
=5（名）．
答：需要工人5名．
故答案为：5．
搜题请搜索小程序“爱下问搜题”
某印刷厂平均3名工人5分钟订60册书．要在1小时内装订1200册书，需要工人______名．
5分钟=
小时，1 12
一名工人一小时订的册数是：
60÷3÷
，1 12
=240（册）；
所需的工人数是：
1200÷240÷1，
=5（名）．
答：需要工人5名．
故答案为：5．
| 阅读短文，填空。 | |
All birds are warm-blooded. This means that their body temperature always stays the same. Birds breathe with lungs. A bird's body is covered with feathers. All birds have two wings. Baby birds are hatched from eggs. Birds can see very well. They can't move their eyeballs like people do, so they have to turn their heads to look at something. Birds' ears are round holes on the sides of their heads. There are about 9, 000 kinds of birds in the world. 1. There are over ____________ kinds of birds in the ____________. 2. Birds don't have ears like people do. Their ears are ____________ ____________ on the sides of their heads. 3. Birds can't move their ____________ so they have to turn their ____________ to look at something. 4. Birds have hundreds of ____________ but only two ____________ and ____________ wings. |