| 标题 | 解决时间 | 回答数 | 回答者 |
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| 介质:声音在固、液、气体中均可传播。 [力和运动] | 2020-08-14 | 5 | |
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| 老师,数码相机和光学相机有什么区别呢? [声和光] | 2020-08-14 | 2 | |
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