题目

请写出如图18所示的几个实验所揭示的物理道理:甲:                                                                     乙:                                                                     丙:                                                                     丁:                                                                       答案:甲:液体可以传声 乙:水蒸气遇冷液化 丙:真空无法传声 丁:光沿直线传播  解析:略 
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