一个用电设备在单位时间内(1s)所消耗的能量叫( )。A．电流 B

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问题单项选择题

一个用电设备在单位时间内(1s)所消耗的能量叫( )。

A．电流

B．电功率

C．电压

D．电阻

答案

参考答案：B

填空题

1.	He is in the ________ (classroom, washroom).
2.	They're ________ (teachers, students). They're in the ________ (gym, classroom).
3.	They are in the ________ (gym, office).
4.	This ________ (shirt, skirt) is ________ (old, new). I like it.
5.	I have ________ (three, four) ________ (pencils, pencil) in the pencil box.

问答题简答题

么是慢速充电？什么是快速充电？什么是换电？