关于此电子书
A crack of lightning. The blue glow of a phone screen. A blinking firefly. The blazing sun. A camera’s rapid flash. No matter the source, light travels in waves, and it does so at a speed faster than anything else in the universe. But what is light, anyway, and how do we study it? In this book, readers in grades 4-9 will learn about light waves and light’s properties and how people–and animals–manipulate light for their own purposes. This series features a variety of science topics aligned to NGSS standards. From mixing matter to the study of sound waves, each informative book includes a glossary, comprehension questions, and an activity for home or the classroom.
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智能手机和平板电脑
笔记本电脑和台式机
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