两个定值电阻串联后接在输出电压U稳定于12V的直流电源上，用一个

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两个定值电阻串联后接在输出电压U稳定于12V的直流电源上，用一个内阻不是远大于的电压表接在两端（如图），电压表示数为8V，如果把此电压表改接在两端，则电压表的系数将

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A．等于4V

B．小于4V

C．大于4V小于8V

D．等于或大于8V

答案

答案：B

填空题

用when或 while填空

1. we were talking in the classroom, the teacher came in.

2. they got to the airport, it was raining.

3. she was reading a book,the phone rang.

4. I saw the boy, he was wearing a new coat.

5. he was reading,he fell asleep.

判断题

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