The PPT teaching objectives of "Sound Propagation" in Science 4 of the Jiangsu Education Board: 1. Know that sound can propagate in solids, liquids, and gases, but not in vacuum, that is, the medium of sound propagation. 2. Know that different objects propagate sound at different speeds. 3. Through the study of this lesson, students will be intrigued by the curiosity of nature.
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