搜题请搜索小程序“爱下问搜题”
问题 解答题

蓝天运输公司要将300吨物资运往某地，现有A、B两种型号的汽车可供调用．已知A型汽车每辆最多可装该物资20吨，B型汽车每辆最多可装该物资15吨．在每辆车不超载的条件下，要把这300吨物资一次性装运完．问：在已确定调用7辆A型车的前提下至少还需调用B型车多少辆？

答案

设至少还需调B型车x辆，由题意得

7×20+15x≥300

解得x≥10

2
3

因为x取整数

所以至少应该调用B车11辆．

填空题

在生产保护措施中，（）措施损失较小。
查看答案
补全对话，情景问答

补全对话。

Larry: What beautiful pictures!

Tom: No, they're not pictures. 1. ____________________.

Larry: Stamps? 2. ____________________.

Tom: They are used for posting letters.

Larry: 3. ____________________?

Tom: I've got more than 700 of them.

Larry: 4. ____________________?

Tom: I've been collecting them since I was five years old.

Larry: what are you going to be when you grow up?

Tom: I'm going to be a stamp designer (设计师).

Larry: 5. ____________________?

Tom: I'm going to study art really hard and go to an art college.

Larry: I hope your dream can come true.

Tom: Thank you.
查看答案