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【单选题】
羧酸具有酸性的原因是( )A.
羧基的供电子诱导效应
B.
羧基的吸电子诱导效应
C.
羧基的π-π共轭效应
D.
羧基的p-π共轭效应
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What do you know about Mary and John?
A.
They are good friends
B.
They are both interested in Chinese culture.
C.
They met each other before.
D.
They are both interested in music.
【单选题】患者，男性，60岁，反复咳嗽、咳痰20余年。受凉后出现咳嗽、咳痰伴胸闷、气短加重1周，在家给予氧疗后症状无缓解，1h前出现呼之不应，急诊入院。查体神志模糊，双肺哮鸣音，血气分析：PaO255mmHg，PaCO270mmHg。 该病人出现神志变化的原因最可能的是
A.
气道阻力增加
B.
感染加重
C.
氧疗不当
D.
合并心力衰竭
E.
周围循环衰竭
【简答题】当图框线的宽度为b毫米时,A0和A1号图的标题栏外框线宽度为______b毫米,A2、A3、A4号图的标题栏外框线宽度为______b毫米。
【单选题】Do you know where Mary when you met her on your way to school?
A.
had gone
B.
was going
C.
has gone
【单选题】— Do you know where Mary is? I couldn’t find her anywhere. — Well . She have gone far—her coat’s still here.
A.
shouldn’t
B.
mustn’t
C.
can’t
D.
wouldn’t
【简答题】图框线的宽度为 , A0 和 A1 号图的标题栏外框线宽度为 , A2 、 A3 、 A4 号图的标题栏外框线宽度为 。
【单选题】—Do you know where Mary is? I couldn’t find her anywhere. —Well . She have gone far—her coat’s still here.
A.
shouldn’t
B.
mustn’t
C.
wouldn’t
D.
can’t
【单选题】听力原文：W: Do you know that Mary was severely scolded by the boss because she turned down the contract with her major client yesterday? M: I can't believe she did that. Q: What do we learn about Mary? (1...
A.
She lowered, the contract's original price.
B.
She went ahead with the proposal.
C.
She didn't accept the offer given by her client
D.
She made a counter-offer to relieve the client.
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