The purpose of the video studio wall, which normally contains soft packages of leather material, as illustrated by the diagram, is () a. Depressive b. Increased echoes of sound c. Increases the sound intensity d. Increases the impact of the decorative effect of the two identical ceramic cups shown in the map, each with a hot tea and half a cold milk, which, if mixed together, may as soon as possible be made with a low-temperature milk tea, is (a. Cold tea with 2min, then cold milk with a glass of glass of glass in the hot cup of tea b. Puts cold milk in the hot cup of tea, cooling with 2min c. Cold tea with 2min, then pouring hot tea into cold milk cups of milk, and cold with 2min in the cold milk cup of milk in the summer of 3. Without regard to the evaporation of water, when all the ice in both cups melts, both the mid-water and the initial-hour cups are () a. Above the water in the initial-time cups. Both b. And the initial-time cups are at the same level as the first-time cups. C. The left-side cups are at the same level as the first-time cups, and the right-side cups are at the same level as the first-time cups. D. The left-side cups are at the same level as the first-time cups, and the right-side cups are at the same level as the first-time-time water. 4. When the small light-light glass is used to drink soda, it is found that the first-to-be-injection tubes that were inserted into the bottom of the bottle will float themselves, but not in the cold water, as shown in the figure. An analysis of this phenomenon is correct in the following remarks: () a. B. Suction density is less than soda density and therefore b. B. B. B. Suction is very thin and rises due to the luminous effect of internal liquid surfaces
