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【多选题】
生地黄的功效为
A.
清热泻火
B.
清热燥湿
C.
清热解毒
D.
清热凉血
E.
养阴生津
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【简答题】芳香化合物A( )在一定条件下可以发生如下图所示的转化(其他产物和水已略去)。 请回答下列问题: (1)请写出A的分子式 。 (2)1molA在氢氧化钠溶液中加热,充分反应消耗氢氧化钠 mol。 (3)有机物C可以由乳酸( )经过几步有机反应制得,其中最佳的次序是: 。 a.消去、加成、水解、酸化      b.氧化、加成、水解、酸化 c.取代、水解、氧化、酸化      d.消去、加成、水解、氧...
【简答题】Which of the following Lewis structure is definitely incorrect?A. B. C. D. E.
【判断题】The maximal onset principle states that when there is a choice as to where to place a consonant, it is put into the coda rather than the onset.
A.
正确
B.
错误
【单选题】When is onset of physiological jaundice in a newborn ?
A.
2th to 3th days
B.
1th to 2th days
C.
3th to 4th days
D.
4th to 5th days
E.
after two weeks.
【单选题】The Lewis structure of HCN (H bonded to C) shows that __________ has __________ nonbonding electron pairs.
A.
C, 1
B.
N, 1
C.
H, 1
D.
N, 2
E.
C, 2
【简答题】According to _________, when there is a choice as to where to place a consonant, it is put into the onset rather than the coda. (the maximal onset principle)
【单选题】when is onset of physiological jaundice in newborn children?
A.
2 to 3 days
B.
1 to 2 days
C.
3 to 4 days
D.
4 to 5 days
E.
after two weeks.
【单选题】Acetic acid (C2H4O2) was discovered in 1996. It has 24 valence electrons and the Lewis structure is below. How many lone pairs are there?
A.
2
B.
3
C.
4
D.
5
【简答题】在化学实验中,常常依据反应伴随的现象来确定反应是否发生.请按要求写出化学方程式. (1)反应中伴有发光、放热现象______; (2)加热某种固体(或固体混合物),反应后固体质量减小______; (3)根据下表写出有沉淀生成的复分解反应______. NO 3 - SO 4 2- OH - K + 溶 溶 溶 Na + 溶 溶 溶 Cu 2+ 溶 溶 不溶
【简答题】How can the Hill and the passions of the people be controlled according to the author?
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