题目内容

生物碱的色谱法检识可应用于

A. 测定中药和中药制剂中生物碱的含量
B. 检查生物碱的纯度
C. 确定总生物碱中单体的含量
D. 鉴定已知的生物碱
E. 判断生物碱的碱性强弱

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生物碱的沉淀反应

A. 一般在稀酸水溶液中进行
B. 可不必处理酸水提取液
C. 选用一种沉淀试剂反应呈阳性,即可判判断有生物碱
D. 有些沉淀试剂可用作纸色谱和薄层色谱的显色剂
E. 可应用于生物碱的分离纯化

东茛菪碱具有的反应是

A. 碘化铋钾橙红色沉淀
B. 氯化汞试剂砖红色沉淀
C. Vitali反应阳性
D. 氯化汞试剂白色沉淀
E. 雷氏盐沉淀呈粉红色

Before shipment, the buyers generally send their_____ to the sellers, informing them of the packing and mark, mode of transportation, etc.

A. shipping documents
B. shipping requirements
C. shipping advice
D. shipping marks

The exporters usually send by cable their _______ to the buyers immediately after the goods are loaded onboard the ship, informing them of the shipment.

A. Shipping Documents
B. L/C Amendments
C. Shipping Advice
D. Sales Contract