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【单选题】
有酸性，也能发生反应的物质是A.
甲酸
B.
苯甲酸
C.
甲醛
D.
乙酸
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反馈参考答案：
举一反三
【单选题】Sepic 斩波电路的特点是( )。
A.
电源电流断续但负载电流连续
B.
电源电流连续但负载电流断续
C.
电源电流和负载电流都断续
D.
电源 电流和负载电流都连续
【单选题】I know you are a busy man. I don't want to too much of your time.
A.
take over
B.
take away
C.
take out
D.
take up
【简答题】王强与李刚都在银行存了钱，王强存的钱加上20元就与李刚同样多；李刚存的钱减少 2 9 ，就与王强同样多．王强和李刚各存了多少钱？
【简答题】听句子，选择正确答语。每个句子读一遍。 ( )1. A. Dress. ( )2. A. Sorry, I don't know. ( )3. A. Thank you. ( )4. A. Leather shoes. ( )5. A. I agree with you. B. Coat. B. That's cool! B. That's all righ...
【简答题】听句子，选答语。 ( )1.A. Sorry, I don't know. ( )2.A. Yes, I like coffee very much. ( )3.A. It's thick and cold. ( )4.A. Yes, I could. ( )5.A. Don't say that. B. Congratulations. B. No, th...
【单选题】--- Can you tell me how to get to the airport? --- ____________________. A. Certainly , you can take No 3 bus. B. No, I don't know how.
A.
Certainly , you can take No 3 bus.
B.
No, I don't know how.
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