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问题 单项选择题

图示电路中，已知：Us=1V，Is=1A，R1=R2=R3=1Ω，支路电流I1、I2分别是：（）

A.-2A，-1A

B.-1A，-2A

C.1A，2A

D.-1A，0A

答案

参考答案：C

问答题

回答下列问题。

1. When is your birthday?

    _____________________

2. What color is Tom's T-shirt?

    _____________________

3. Can her parents play volleyball?

    _____________________

4. Where does Li Ming do his homework?

    _____________________

5. What time is it?

    _____________________

6. What's your favorite subject?

    _____________________
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单项选择题

加助燃剂是为了降低烟气中（）含量，防止大气污染。

A.二氧化碳

B.二氧化硫

C.氮

D.一氧化碳
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