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【单选题】
电缆管弯制时一般弯曲程度不大于管子外径的( )A.
30%
B.
50%
C.
10%
D.
100%
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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
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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.
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.
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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.
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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