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【简答题】
从大黄中提取游离蒽醌,药材先用一定浓度的硫酸加热,目的是 。
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反馈参考答案：
举一反三
【单选题】Miss Li ___ as a secretary for five years in the company, and now she is general manager of it.
A.
has served
B.
had served
C.
served
D.
serves
【单选题】Through years of hard work, Mrs. Smith, who ____ as a secretary for five years, is general manager of the company now.
A.
serves
B.
served
C.
has served
D.
had served
【简答题】财政政策对增加均衡国民收入效果较好的条件是什么？
【简答题】交流工频安全电压的上限值是指在任何情况下,两导体间或任一导体与地之间的电压都不得超过()V。
【简答题】交流工频安全电压的上限值,在任何情况下,两导体间或任一导体与地之间都不得超过() V 。
【单选题】Choose the right structure of the computer which is general used，such as PC8086，Z-80， IBM360/3
A.
Single Instruction Single Data
B.
Single Instruction Multiple Data
C.
Multiple Instruction Single Data
D.
Multiple Instruction Multiple Data
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