问题
多项选择题
在下列关于食品水分及水分活性的说法中，正确的包括（）
A．食品中水分等营养学性质是构成食品成分的一个重要的因素
B．水分活性在0.8以上的食品，需以冷藏等方法来控制微生物
C．0.6至0.8(中等水分食品)无需冷藏,但要限定其保质期
D．0.6以下(低水分食品)，则往往货架期较长，更无需冷藏
答案
参考答案：A, B, C, D
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在下列关于食品水分及水分活性的说法中，正确的包括（）
A．食品中水分等营养学性质是构成食品成分的一个重要的因素
B．水分活性在0.8以上的食品，需以冷藏等方法来控制微生物
C．0.6至0.8(中等水分食品)无需冷藏,但要限定其保质期
D．0.6以下(低水分食品)，则往往货架期较长，更无需冷藏
参考答案：A, B, C, D
subjects. Well, Bacon tells you to “look at weak places in your armor (盔甲)”, and shows you how to fill up the blanks in your knowledge. On the other hand, it is no good just trying to fill your mind with knowledge. Knowledge in itself is often useless. A mind filled with too much knowledge is like a room too full of furniture; a man cannot walk about freely in it, and look out of the windows. It is much better to concentrate on a few subjects that interest you and to deal lightly with the others than to march heavily through the whole range of learning, like a silly tourist going through a museum and not missing a single object. If you try to master every subject you may become very wise, but you will be very lonely and you will probably lose all your friends. So you must learn to pick and choose, and you must also learn to look here and there in a library like a camel eating grass on the grassland. If you watch it eating, you will see that although he is supposed to be one of the most stupid animals in the world, he has at least one of the qualities of the cultured man, the power to pick and choose. A student looking for mental food in a library should take the camel as his model.