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Anonymous users2024-01-24A. The sound of Xiao Ming's bedside alarm clock affects our rest, which is noise, which is in line with the topic;
B. The alarm sound of the fire truck on the road will not have a negative impact on people and the surrounding environment, it is not noise, and it does not meet the topic;
D. During the evening self-study, the loud singing from the next class affected the learning of other students, which was noise and in line with the topic;
Therefore, AD is chosen
Agriculture belongs to the primary industry The activity sector of using land resources for planting is planting, and the use of land space for aquaculture is aquaculture, also known as fishery, and the use of land resources to cultivate and harvest forests is the department of forestry, and the use of land resources to cultivate or directly use grassland to develop animal husbandry is animal husbandry Therefore, B is in line with the topic >>>More
A. In the process of boiling water, only the state changes, and no new substances are generated, which is a physical change B. Only the shape is changed during the breaking of the porcelain bowl, and no new substances are generated, which is a physical change C. There are new substances such as carbon dioxide in the process of gas combustion, which is a chemical change D. There is no new substance generation in the process of salt agglomeration, which is a physical change, so choose C
There is no new substance generation in the juice squeezed by B, so it is a physical change, and there is a new substance generation in apple rotting and kitchen knife rusting, which is a chemical change, so B. is chosen
A. There are new substances such as carbon dioxide generated during the combustion process of liquefied gas, which belongs to chemical changes B. There are no new substances generated in the process of squeezing juice, which belongs to physical changes C. There are new substances generated in the process of bread mold, which belongs to chemical changes D. There are new substances in the process of kitchen knife rust generation, which belongs to chemical changes so choose B
A. In the process of volatilization of white vinegar, only the state changes, and no new substances are generated, which is a physical change B. There are new substances in the process of rusting in the iron pot, which is a chemical change C. There are new substances such as carbon dioxide in the process of natural gas combustion, which is a chemical change D. There are new substances generated in the process of food becoming rancid, which is a chemical change Therefore, A