在如图所示的闭合电路中，闭合电键，当滑动变阻器的滑片向右移动时，()。
A．电流表示数变大，电压表示数变大
B．电流表示数变小，电压表示数变大
C．电流表示数变大，电压表示数变小
D．电流表示数变小。电压表示数变小
参考答案：C
解析：
滑动变阻器的滑片向右移动，电阻变小，电路中总电阻变小，总电流变大，电流表示数变大，电池内阻和定值电阻分担的电压变大，滑动变阻器两端电压变小，电压表示数变小。
| 用方框内所给单词的适当形式填空。 | |
2. The man jumped down to safety ____. 3. Here is a photograph of our village. Our village is in a ____. 4. She ____ down to tie her shoe laces. 5. He said that he ____ English to maths. 6. They were ____ to face up to the difficulties. 7. After ____ he went abroad for further education. 8. The water is ____. Would you turn off the stove? 9. The river ____ into the sea. 10. Has he made the exam ____? |