1) sound cannot travel through a) space b) forests c) oceans d) houses e) liquids f) caves 2) sound travels better through a) gasses b) liquids c) solids 3) sounds travels at different speeds through different materials a) true b) false 4) sound waves travels at the same speeds a) true b) false 5) sound waves travels through walls and doors a) true b) false

science

打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？