单项选择题
重结晶苯甲酸常用的溶剂是()
A、乙醇
B、水
C、乙醚
D、乙酸乙酯
重结晶苯甲酸常用的溶剂是()
A、乙醇
B、水
C、乙醚
D、乙酸乙酯
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单项选择题
In which year the world's population lived in urban areas is more than 50% for the first time in history?
In which year the world's population lived in urban areas is more than 50% for the first time in history?
A.2007
B.2000
C.2010
D.2005