it travels 300,000 kilometres a second是什么意思

it travels 300,000 kilometres a second是什么意思 it travels 300000km a second是什么意思 八下 英语 选词填空before,discover,fast,in,come,watch,so,fast,it,ago,shine,not canLight travels at a speed which is about a million times ( ) than that of sound.( ) one second,lidht travels about 300,000 kilomemters,but sound traves only 340 m 英语翻译Light trave at a fast speed.It is about a million times faster than sound.In one second,Iight travels about 300,000 kilometres,but sound travels only 340 metres.You may have some knowledge of this difference by watching the start of a run it travels all day and all night（翻译） It travels at 1,020km per hour Light travels 300,000 kilometres a second谁能帮我准确的译一下,谢谢! 连词成句（英语——初一）second、speed、a、of、300,000km、light、per、travels、at It travels very slowly .对very slowly提问____ does it travel? 判断正误Light travels at a speed which is about a million times 急.The Speed of Light　　Light travels at a speed which is about a million times faster than the speed of sound.　　In one second,light travels about 300,000 kilometres.　　Bu Light travels at a speed which is about a million times faster than the speed of sound.In one second,light travels about 300,000km.But sound travels only 344m.You can get some idea of this difference by watching the start of a race.If you stand some A blimp travels 2 hours with the wind and 5 hours against it It ( )that light travels faster than soundA.believe B.believed C.is believed速度 It is known to all that light travels in straight lines. 怎么改成强调句 The moon travels round the earth,it is our _____________.填一个词 It's_common knowledge that light travels faster than soundA.a B.an C.the D/ Light travels at about____.A.300 000 kilometres a second B.300 000 kilometres every second 选哪项?为什么?每小时5英里怎么表示? 上海教育出版社初中英语课本78页的答案The fastest thing in space is light.Light travels at aspeed of 300,000 km per.的中文意思