41: 利用羟丙基葡聚糖凝胶过滤柱色谱法分离苷类化合物时,##先分离出来,##随后分离出来,##最后分离出来。 ...
(判断题)35: 甾体皂苷可被中性乙酸铅沉淀。 A: 对 B: 错 ...
(判断题)29: Sephadex LH-20分离苷类化合物时,通常是单糖苷首先被洗脱出柱。 A: 对 B: 错 ...
(名词解释)23: Liebermann-Burchard反应 ...
(单选题)17: 能与胆甾醇生成水不溶性分子复合物的是 A: 体皂苷 B: 生物碱 C: 单萜 D: 黄酮 ...
(单选题)11: 用于鉴别木脂素中亚甲二氧基的显色反应是 A: Labat反应 B: 异羟肟酸铁反应 C: Gibb's反应 D: 三氯化铁反应 E: 磷钼酸试剂反应 ...
(单选题)5: 最难被酸水解的是 A: 碳苷 B: 氮苷 C: 氧苷 D: 硫苷 ...
(问答题)23: 英译汉:Manners are the ornaments that make a woman a lady and a man a gentleman. ...
17: 阅读理解第2篇:判断正误题:请根据短文回答(1)-(5)小题 People born in the summer are more likely to be healthy than those who arrive during other times of the year, new research suggests. The phenomenon could be caused by mothers g...
(单选题)11: The aim is neither to judge nor to force forgiveness, but rather to ______ understanding. A: foster B: harvest C: brighten D: activate ...