Difficulty: difficulty: mid-range questions type: Q & A questions: hollow brick is the country to promote the building materials, it is better than the solid brick, please write two advantages of using hollow brick.
Hollow brick with pores, is not conducive to the spread of noise So the use of hollow brick building with sound insulation effect The density of the air is less than the density of the concrete The mass of the object is equal to the product of its density and volume Therefore, the same volume of hollow brick is smaller than the weight of the solid brick So the answer: the use of hollow brick building with sound insulation effect Use hollow brick building to carry light
Answer: the external environment of the noise into the room needs medium
The propagation condition of the sound can be propagated in the gas, the solid, the liquid, and the sound propagates in the gas less than the propagation speed in the solid and the liquid
