打开App
360P
初二物理，某人在山崖之间大喊，经过多长时间能听到二次回声？
初二物理，某人在山崖之间大喊，经过多长时间能听到二次回声？
郝老师讲初二物理声现象53/70
App03:40
App02:50
App03:32
App03:54
App03:45
App03:46
App01:44
App03:32
App02:18
App02:08
App02:18
App03:57
App02:54
App06:35
App04:06
App04:44
App05:10
App02:32
App01:27打开App观看
![大连市气象局发布海上大风蓝色预警[IV级/一般]](http://p3-sign.bdxiguaimg.com/tos-cn-p-0015/oY7CsFC7EDOdeOBqiAPMAmorIfAISnBE6cQf4D~tplv-pk90l89vgd-fglass:864:486:90.jpeg?appId=32&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=101_middle_image&imageType=list&isImmersiveScene=0&is_stream=0&lk3s=9d3f5bff&logId=2025010719130374CDEA34BA0BF53FA605&requestFrom=101&x-expires=1767784384&x-signature=ZyzMZ2a0ZAG%2BE9QkWK5uwqV01ms%3D)
