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【单选题】
关于甾体皂苷红外光谱说法错误的是A.
可用于鉴别螺旋甾烷与异螺旋甾烷
B.
结构中F环有相似的四条谱带
C.
其中C 27 α-型的857～852cm -1 处吸收较899～894cm -1 处的强2倍
D.
C 27 β-型的920～915cm -1 处吸收较899～894cm -1 处的强3～4倍
E.
C 27 α-型的899～894cm -1 处吸收较920～915cm -1 处的强2倍
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皮皮学刷刷变学霸
举一反三
【简答题】下列气体哪个属于刺激性气体（ ）。
【单选题】A __________ statement is a general term for a personalized financial record that regularly informs a recipient about the status of his or her account. It is generally mailed to the recipient on or ne...
A.
instantly
B.
weekly
C.
monthly
D.
daily
【简答题】有一个 50μF 的电容器,接到 的工频交流电源上,求电容的电流有效值和无功功率。若将交流电压改为 500 Hz ,求通过电容器的电流为多少?
【单选题】Arbitrage______.
A.
is a general economic term for buying something where it is cheap and selling it where it is dear
B.
keeps exchange rates consistent across markets
C.
has been outlawed by the International Monetary Fund
D.
cannot occur where there is a forward exchange market
E.
both A and B
【简答题】It is a general term for all the statistics used to describe the typical value of a variable.
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