皮皮学,免费搜题
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搜题
【判断题】
醛基与苯环直接相连的芳香醛能发生 Perkin反应( )
A.
正确
B.
错误
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举一反三
【单选题】心绞痛的药物治疗应首选
A.
硝酸甘油
B.
钙拮抗剂
C.
利尿剂、血管扩张剂、强心剂
D.
利多卡因
E.
胺碘酮
【单选题】Inmarsat-F船站中的语音压缩编码采用AMBE调制方式,AMBE称为( )。
A.
脉冲编码调制
B.
自适应预测编码
C.
高级多带激励编码
D.
差错控制编码
【单选题】在Inmarsat-B/F船站的基带处理单元中含有语音压缩编码,它可以实现( )。
A.
收/发隔离
B.
模/数转换
C.
频带信号与基带信号的转换
D.
单边带调制
【简答题】Listen to the passages and choose the best answers. 1 . What's the purpose of the calling? A. Wang Lin wants to make an order . B. Wang Lin wants to change the order . C. Wang Lin wants to cut down th...
【单选题】The Bayh-Dole Act______.
A.
aims to change the missions of universities
B.
aims to enhance academic motivation in universities
C.
has hindered the sharing in academic world
D.
has stimulated scientific discovery
【简答题】听下面一段对话,回答第1至3题。 1. What's the purpose of the writing club? [     ] A. To write articles for the Campus Literary Review. B. To teach students a couple of basic writing skills. C. To help those who wan...
【简答题】听下面一段材料,回答第1至2题。 1. What's the purpose of carpooling? [     ] A. To go for a long trip to Seattle. B. To learn how to drive skillfully. C. To save money, energy and the environment. 2. How will they g...
【简答题】What's the purpose of your visit here?
【简答题】Can I Take a Message-2.MP4 Now watch again. Check the numbers and them get ready to answer the following two questions. What's the purpose of Stu's ca;;omg Pam?
【简答题】Please answer some questions about the text. ( Record your answer and upload it!) 1. What's the purpose of the text? And who is the text written to?
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