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【单选题】
TLC法检查盐酸普鲁卡因中的对氨基苯甲酸,药典规定所用的喷雾显色剂是A.
对二甲氨基酸
B.
对二甲氨基苯甲醛
C.
对氨基苯磺酰胺
D.
香草醛
E.
异烟肼
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反馈参考答案：
举一反三
【单选题】The author’s attitude towards the judge’s ruling could be described as ________.
A.
doubtful
B.
critical
C.
cautious
D.
supportive
【单选题】Unfortunately, the aboriginal(土著) people tried in vain to win independence ______ the ruling tribe, and prejudice ______ them still continued. [ ]
A.
of, towards
B.
on, for
C.
from, against
D.
by, over
【简答题】二极管的正向电阻比反向电阻大____
【单选题】The (ruling) party could even lose (its) majority in the lower house of parliament, (started) a period of (prolonged struggling).
A.
ruling
B.
its
C.
started
D.
prolonged struggling
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