声音的传播需要物质,物理学中把这样的物质叫做介质,真空不能传声.
故答案为:物质;介质;真空.
声音的传播需要_,物理学中把这样的物质叫做_,_不能传声.
声音的传播需要______,物理学中把这样的物质叫做______,______不能传声.
物理人气:343 ℃时间:2019-10-10 05:30:54
优质解答
我来回答
类似推荐
猜你喜欢
- 1SO2、H2、2H、2H2、Mg+2、Mg2+中“2”的意义,还有符号的意义?
- 2they care going to help the farmers______their work on the farm A on B of C with D to
- 3She would like to visit somewhere relaxing.对somewhere relaxing提问:__ __ she would like to visit?
- 4已知空气中氮气的沸点是-196摄氏度,氩气的沸点是-186摄氏度,氧气的沸点是-183摄氏度
- 5(三加一)乘以(三的二次方加一)乘以(三的四次方加一)......(三的六十四次方加一)等于多少?
- 6关于做一名志愿者的英语作文
- 7已知函数f(x)=x2-lnx. (1)求曲线f(x)在点(1,f(1))处的切线方程; (2)求函数f(x)的单调递减区间: (3)设函数g(x)=f(x)-x2+ax,a>0,若x∈(O,e]时,g(x)的最小值是3,
- 8童年中的好词好句好段第二章
- 9I usually come home by bike,but sometimes I( ) .a.walk b.on foot c.take bus d.by a bus
- 10分析Nothing in life is to be feared.It is only to be understood.