题目内容

下列有关治疗指数的阐述正确的是

A. 数值越大越安全
B. 数值越大越不安全
C. 可用LD9JEDs表示
D. 可用LD50/ED95表示
E. 与半数有效量无关

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某含氧化合物分子没有对称性,根据如下13C NMR谱图确定结构,并说明依据。

电子金融创新的主要功能是()。

A. 把电脑技术应用于金融资产的交易过程
B. 把电脑技术应用于金融资产的交割过程
C. 把电脑技术应用于金融信息的收集、分析、传播、交流和金融资产等的管理过程
D. 把电脑技术应用于金融风险的驱散过程

某化合物(M=58),根据如下13C NMR谱图确定结构,并说明依据。

50

A. Lindbergh used this additional training to get a job as an airmail pilot, flying out of St. Louis, MissouriB.Working with an aviation company from San Diego, California,and with financial help from the city of St. Louis, Lindbergh got a customized(定制的)airplane that could make the journeyC.He also received a Medal of Honor,the highest United States military decorationD.Eighty years ago,radio and movies were just beginning to have that kind of effect on Ameri- cansE.His childhood was not full of fond memoriesF.He quit school and moved to Nebraska where he learned to be a pilot

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