已知一组数据1，2，0，-1，x，1的平均数是1，则这组数据的极差为_爱下问搜题

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问题填空题

已知一组数据1，2，0，-1，x，1的平均数是1，则这组数据的极差为（）。

答案

4

问答题

电动机的额定电压是220V，额定功率是2.2kW，线圈的电阻是1Ω，求：

（1）电动机正常工作时的电流多大？

（2）1s时间内线圈上产生的热量是多少？

（3）1s时间内转化的机械能有多少？

补全对话，情景问答

从方框中选择最佳选项完成对话，有两项多余。

A. Do you want to go with us?
B. Why do you like us?
C. What do you want to do this weekend?
D. Let's take a bus there.
E. Where is the zoo?
F. What animals do you like best?
G. How many zoos are there in our city?

A: Hey, Henry.   1______
B: I don't know. What about you?
A: I want to go to Center Zoo to see the animals with my sister. 2______
B: Of course. I like animals.
A: Really?  3______
B: I like elephants best.
A:  4______
B: Because they're friendly and they can help people work. How do we get to the zoo then?
A:  5______