单选题
发布日期:2021-03-29
安全的原则
有效的原则
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Chemistry is the study of the behavior and composition of matter. All foodsare made up of chemical substance which undergoes chemical changes when cooking 1._______in an oven or digested within the body. The cooking of meat and vegetables induce 2._______chemical changes, making it more delicious; similarly the leavening action of 3._______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion. Cookery is a science requiring for a knowledge of chemistry. 4._______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, scream-ing agents, preservatives, etc. Each is carefully prepared before painstaking 5._______research. It is therefore essential for trained cookers to understand 6._______chemical science in order to appreciate the chemistry nature of foods 7._______and the changes achieving on cooking. Homeworkers should also 8._______know cleansing agents and textiles used in the home and how the latter 9._______responds to the effects of heat, light, water, and chemical cleansing agents. 10._______
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以下业务中,不属于移动通信基本业务的是()。
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