问题
选择题
一列火车，由静止从车站开出，100s后速度可达25m/s，在此期间火车共行驶1km，则火车在这100s内的平均速度是[ ]
A．10 m/s
B．12.5 m/s
C．20 m/s
D．25 m/s
答案
答案：A
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一列火车，由静止从车站开出，100s后速度可达25m/s，在此期间火车共行驶1km，则火车在这100s内的平均速度是[ ]
A．10 m/s
B．12.5 m/s
C．20 m/s
D．25 m/s
答案：A
| 选择方框中的句子完成对话，其中有两项多余。 Mike: Hi, Jim. 1 Jim: I am going to the gym. Mike: 2 Jim: I'm going to take part in the football match there. 3 Mike: Of course. I'll go there to cheer you on. Jim: Oh. It's very good. 4 Mike: Yes, I do. But I don't play very well. Jim: You need more practice. Mike: Yes, you're right. 5 Jim: At five o'clock. Mike: Oh, it's ten past four now. Let's hurry. | |
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