含有乙醛基或其半缩醛的单糖。
Any of a class of monosaccharide sugars containing an aldehyde group.
不过要知道，固体中和平衡时溶液中的单糖是以开链型环状半缩醛占多数。
However, it must be understood that cyclic hemiacetals of those open-chain forms prevail I solids and at equilibrium in solutions.
这些化合物能溶于水，并含有游离的半缩醛羟基，所以在碱溶液中能还原银离子和铜离子。
These compounds are soluble in water, and contains the hemiacetal hydroxyl free, so in alkaline solution can reduce silver ions and copper ions.
这些化合物能溶于水，并含有游离的半缩醛羟基，所以在碱溶液中能还原银离子和铜离子。
These compounds are soluble in water, and contains the hemiacetal hydroxyl free, so in alkaline solution can reduce silver ions and copper ions.
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