在图示电路中，电源电压不变，闭合开关S后，灯L1、L2都发光，一

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问题选择题

在图示电路中，电源电压不变，闭合开关S后，灯L₁、L₂都发光，一段时间后，其中的一盏灯突然变亮，而电压表V₁的示数变小，电压表V₂的示数变大，则产生这一现象的原因是

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A．灯L₁断路

B、灯L₁短路

C．灯L₂断路

D．灯L₂短路

答案

答案：B

填空题

用所给词的适当形式填空

1. —How many ______(sheep) are there on the hill?

—Twenty-one.

2. The ______(leaf) on the trees turn yellow when autumn comes.

3. We should do morning exercises every day to keep ______ (health).

4. —Can I help you ?

—I'd like two ______ (kilo) of pork .

5. My friends and I go swimming ______ (two) a week in summer.

6. ______ (卷心菜) are my favourite.

7. Millie likes to have a bowl of ______ (汤) before meals.

8. It's not a good habit to go to school ______ (没有) breakfast.

9. Best ______ (祝愿) to your parents .

10. Jane and Linda want to be ______ (舞蹈) when they grow up.

问答题简答题

有一块0.1级量程为10A电流表，经检定最大示值误差为80毫安，该表不合格。如果最大示值误差为8毫安，该表合格。问该表是否合格？