有两个电路元件A和B，流过元件的电流与其两端电压的关系如图甲所

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问题选择题

有两个电路元件A和B，流过元件的电流与其两端电压的关系如图甲所示。把它们串联在电路中，如图乙所示，闭合开关S，这时电流表的示数为0.4A，则电源电压和元件B的电功率分别是

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A. 2.0 V.0.8 W

B. 2. 5 V.l.0W

C. 4.5 V.l.0W

D. 4. 5 V.l. 8 W

答案

答案：C

句型转换

把下列句子变为一般疑问句，并作肯定和否定回答，每空一词。

1. We have to clean the blackboard.

_______ you _______ to clean the blackboard?

Yes, I _______.

No, I _______.

2. He likes to wear black shorts.

______ he ______ to wear black shorts?

Yes, he _______.

No, he _______.

3. The bank is next to the shop.

______ the bank next to the shop?

Yes, _______ _______.

No, ______ _______.

4. He did his homework at home.

_______ he _______ his homework at home?

Yes, ________ ________.

No, ________ ________.

5. They can play basketball after school.

_______ they _______ basketball after school?

Yes, _______ _______.

No, _______ _______.

单项选择题

根据《信托法》，下列关于受益人的说法错误的是( )。

A．受益人可以是自然人、法人，或者依法成立的其他组织

B．委托人可以是受益人，但不得是同一信托的唯一受益人

C．受托人可以是受益人，但不得是同一信托的唯一受益人

D．受益人自信托生效之日起享有信托受益权