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【单选题】
肉毒碱是具有多种生理功能的氨基酸类物质，又名维生素Bt，是一种类维生素。1927年测定了它的结构，1958年发现其能促进脂肪代谢，1985年被指定为“多功能营养品”。下列有关肉毒碱的说法不正确的是 （ ）A.
肉毒碱的分子式为：C 7 H 15 NO 3
B.
肉毒碱能与氢氧化钠反应但不能与盐酸反应
C.
一定条件下肉毒碱能发生酯化反应、消去反应、取代反应
D.
H核磁共振谱（ 1 H-NMR）证明分子中的3个甲基上的氢属等效氢
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【单选题】Paragraph 12: Question What does the author mean by “Now, I am humbler” after he relates his personal experience?
A.
The author means that when he was a university student he was superstitious. In fact he thought what he did with the gypsy woman was simply a joke. But now, after his description and analysis of the various forms of superstition with all kinds of people throughout history, he finds that there is some rationality in it.
B.
The author means that when he was a university student he was not superstitious. In fact he thought what he did with the gypsy woman was simply a joke. But now, after his description and analysis of the various forms of superstition with all kinds of people throughout history, he finds that there is no rationality in it.
C.
The author means that when he was a university student he was not superstitious. In fact he thought what he did with the gypsy woman was simply a joke. But now, after his description and analysis of the various forms of superstition with all kinds of people throughout history, he finds that there is some rationality in it.
【简答题】肘部的关节包括肱尺关节、( )关节和通过环状韧带固定的( )近端关节。
【简答题】气吸附式取料手是利用吸盘内的压力和大气压之间的( )而工作的。
【单选题】A customer purchased a p690 32-way but did not purchase additional ServiceSuite offerings. They asked what type of maintenance is standard on the p690. Which of the following is the most appropriate ...
A.
1 year 7x24
B.
3 years 7x24
C.
1 year 9-5 M-F
D.
3 years 9-5 M-F
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