Light___(travel)300000000 meters a second in the air.
Light___(travel)300000000 meters a second in the air.
英语翻译An auto moves 10 meters in the first second of travel,10
sound travels at 340 meters per second in air.travels 为什么用at
Sound travels in the same way as light___.AdoesBdoCtraveled
A motorboat,which has a speed of 5 meters per second in stil
6.Sound waves travel in the air in much the same way _______
The changes that ——place in air travel during the last sixty
The changes that have taken place in air travel during the l
改错 The changes that took place in air travel during the last
the second day in a week
the second day in a week同义词
the second dag in a week同义词