sound travels at 340 meters per second in air.travels 为什么用at
sound travels at 340 meters per second in air.travels 为什么用at
Light travels at about____.
a train travels 70 feet in 1/10 second.At this s
sound travels through air的中文意思
Sound travels in the form(形式)of _.A.bones B.air C.waves D.vo
英语翻译he travels at some point in his life.这是书上写的 可是Point为什么不加
Sound travels in the same way as light___.AdoesBdoCtraveled
英语固定搭配问题1.doing 2.Light travels faster than sound.为什么用travel
Light travels faster than ----- 是noise还是sound,为什么
sound travels more slowly than
we know sound travels very
the()thing in the universe is light,it travels at 300000 km