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Anonymous users2024-01-24A, through the timbre can distinguish the object Knock the raw watermelon and the ripe watermelon respectively, the timbre they produce is different, and the mother knocks on the watermelon that Xiaohong bought a few times and says that it is not ripe - use the timbre to distinguish between raw and ripe watermelon This option is wrong and in line with the topic
B. The three-pin plug and three-pin socket for the rice cooker are to prevent the leakage of the pot and cause electric shock accidents This option is correct and not in line with the topic
C. The aroma of soybean milk can be smelled as a result of the diffusion caused by the irregular movement of molecules; Correct, but not on topic;
D. When the dumplings just enter the water, the buoyancy is less than gravity, the object sinks, in the process of boiling dumplings, the volume of dumplings slowly increases, so that the buoyancy is greater than the gravity, and the dumplings float when the dumplings float on the water, the gravity is equal to the buoyancy Correct, not in line with the topic
So choose A
A. It is easier to cut vegetables after sharpening the knife quickly, which is to reduce the force area to increase the pressure when the pressure is constant, so A is correct; >>>More
A. Objects can be distinguished by timbre Knock raw watermelon and ripe watermelon respectively, the timbre they produce is different, and my mother knocks on the watermelon bought by Xiaohong a few times and says that it is not ripe - use timbre to distinguish raw and ripe watermelon This option is wrong >>>More
Analysis of test questions: A. Clean the oil pan with detergent, and the emulsion is formed, so the detergent has an emulsifying effect, which is correct but does not meet the meaning of the question, so the choice is wrong; B. Gas combustion releases heat, so using a gas stove to fry vegetables is to use internal energy to heat the object, but it is correct but does not meet the topic, so the choice is wrong; C. The "white gas" coming out of the lid of the pot when cooking rice is the small droplets formed by the liquefaction of water vapor in the pot, not the water vapor formed by vaporization, the water vapor is a colorless gas, which is invisible, and the original question is wrong and in line with the question, so the choice is correct; D. Boiling beef in a pressure cooker is easy to boil, because the boiling point of the liquid increases with the increase of air pressure, so the temperature rises, the easier it is to rot the boiled beef, which is correct but does not meet the topic, so the choice is wrong;
A. The buoyancy of the cooked dumplings is equal to gravity when they float on the water The option is wrong and does not meet the meaning of the topic B. The boiling point of the liquid is related to the air pressure above the liquid surface, the greater the air pressure, the higher the boiling point, and cooking in a pressure cooker cooks quickly, mainly because the gas pressure in the pressure cooker is strong compared with ordinary pots, and the boiling point of water is high, which is correct; >>>More
A. Sharpening is to increase the pressure by reducing the force area, so A is correct; >>>More