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【单选题】
What is“preventative healthcare"? (paragraph 4)A.
emergency healthcare
B.
steps taken to avoid getting sick
C.
healthcare provided by medical experts
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举一反三
【简答题】萃取液中 A 和 B 的比值和萃取相中 。
【单选题】If the elasticity of supply coefficient for a good is one-sixth (in absolute terms), we know:
A.
that for every 1% increase in quantity, there will be a 6% increase in price.
B.
that for every 1% increase in quantity, there will be a 6% decrease in price.
C.
that for every 6% increase in quantity, there will be a 1% increase in price.
D.
that for every 6% increase in quantity, there will be a 1% decrease in price.
【单选题】拟用萃取方法提取丙酮水溶液中的丙酮。原料液的处理量为120kg,其中丙酮的质量分率为0.3。萃取剂为纯氯苯,总量为100kg。在操作条件下,水和氯苯可视作完全不互溶,且以质量比表示相组成的分配系数平均值为K=1.25。单级萃取时丙酮的萃取率是()。
A.
0.597
B.
0.671
C.
0.654
D.
0.683
【单选题】He regards learning as a daily experience as well as a lifetime__________ .
A.
courage
B.
mission
C.
feature
D.
analogy
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