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【简答题】
挡土墙后土的内摩擦角为35°,静止土压力系数是()
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【单选题】能快速区别皂苷和蛋白质水溶液的方法是( )
A.
观察颜色不同
B.
机溶剂萃取分层性状不同
C.
用两者水溶液振荡后泡沫持久性不同
D.
明度不同
E.
热后是否产生沉淀
【单选题】能快速区别皂苷和蛋白质水溶液的方法是（ ）
A.
观察颜色不同
B.
有机溶剂萃取分层性状不同
C.
利用两者水溶液振荡后泡沫持久性不同
D.
澄明度不同
E.
加热后是否产生沉淀
【简答题】根据句意和首字母或提示完成单词。 1. The weather is very hot in s__________. 2. These are my p__________, my father and mother. 3. There is an English-Chinese d__________ on the teacher's desk. 4. How many __________ ...
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【单选题】能快速区别皂苷水溶液和蛋白质水溶液的方法是
A.
观察颜色不同
B.
有机溶剂萃取，分层性状不同
C.
用两者水溶液振荡后，观察泡沫持久性不同
D.
透明度不同
E.
加热后是否产生沉淀
【单选题】能快速区别皂苷和蛋白质水溶液的方法是（）
A.
加热后是否产生沉淀
B.
有机溶剂萃取分层性状不同
C.
利用两者水溶液振荡后泡沫持久性不同
D.
澄清度不同
E.
观察颜色不同
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