题目内容：
56. 羟基香豆素的特殊提取方法为 CA．水蒸气蒸馏 B．碱水煎煮 C．碱水提取酸水沉淀 D．升华法 E．乙醚提取
参考答案：
选择题：56. 羟基香豆素的特殊提取方法为 CA．水蒸气蒸馏 B．碱水煎煮 C．碱水提取酸水沉淀 D．升华法
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A．水蒸气蒸馏 B．碱水煎煮 C．碱水提取酸水沉淀 D．升华法 E．乙醚提取
A．水蒸气蒸馏 B．碱水煎煮 C．碱水提取酸水沉淀 D．升华法 E．乙醚提取
Not only is this problem very important, but it is
Not only is this problem very important, but it is a difficult problem to be sol
Which of the following does the author mention as
Which of the following does the author mention as a cause ofchanges in the role
在课程发展史上，关于学校课程与社会生活关系问题存在三种典型观点，它们是被动适应论、主动适应论和( )
在课程发展史上，关于学校课程与社会生活关系问题存在三种典型观点，它们是被动适应论、主动适应论和( )A.统一论B.平行论C.超越论D.独立论
The assessment of candidates. work is subjective r
The assessment of candidates. work is subjective rather than objective because _
A.囊材B. 抛射剂C.手动泵D. 阀门系统E. 耐压容器可产生气雾剂喷射动力的是
A.囊材B. 抛射剂C.手动泵D. 阀门系统E. 耐压容器可产生气雾剂喷射动力的是