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【单选题】
在重结晶溶剂的选择原则中,正确的是:A.
杂质的溶解度必须很大
B.
杂质的溶解度必须很小
C.
“热溶”是最常用的结晶原理,所以,结晶时应快速降温,则能析出更多晶体。
D.
被重结晶物质在该溶剂中的溶解度曲线应比较陡。
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【简答题】请按照 教材 简答信息系统的概念和特征
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A.
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B.
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C.
（C）5000mm
D.
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