声的传播需要介质,真空传声;钓鱼时,鱼会被岸上的叫喊声吓跑,说明能传声. 发布时间:2017-04-27 04:20 │ 来源:www.tikuol.com 题型:填空题 问题: 声的传播需要介质,真空 传声;钓鱼时,鱼会被岸上的叫喊声吓跑,说明 能传声.
题型:填空题 His father has worked in this factory________ he came here in 1985.A. for B. since C.when 查看答案