题目内容

电路的作用是对电路的传输，变换，分配；是对信号的变换处理，传输

A. 对
B. 错

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电源的定义是将其他形式的能量转换成电能的设备

A. 对
B. 错

Exercise: Make polite requests from the questions.E.g. How old are you?Can I ask you …?Can I ask you how old you are?Where do you live?Could you tell me …?Could you tell me you ?

Exercise: Make polite requests from the questions.E.g. How old are you?Can I ask you …?Can I ask you how old you are?Have you got any change?I'd like to know whether …I'd like to know whether change.

Exercise: Make polite requests from the questions.e.g. How old are you?Can I ask you …?Can I ask you how old you are?Could you lend me £20?I was wondering if …I was wondering if £20.