题目内容

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

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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

Your comments on packing will _____ on to our manufacturers for their reference.

A. be passed
B. passed
C. be passing
D. passing