题目内容

请写出如图所示的几个实验所揭示的物理道理:

                                     

                  

                                                                        

甲:                                                                  

乙:                                                                  

丙:                                                                   

液体可以传声     真空不能传声    光在均匀介质中沿直线传播【答案合理都给分】

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