一列货车和一列客车同时从相距504千米的两地相对开出,4.5小时相遇。客车每小时行64千米,货车每小时行多少千米?
(504-64×4.5)÷4.5=48(千米)
用所给单词的正确形式填空。
1. It takes about ten______ (minute) to walk to school.
2. We enjoyed______ (we) that day.
3. He is very______ (friend) to us.
4. There are some______ (sheep) on the hill.
5. Taking a plane is______ (quick) than taking a train.
简述YJ17卷烟机常见的故障停机并显示的内容。