What is reflection of light?, a, b, State one law of reflection., a, b, What is a plane mirror?, a, b, Define refraction of light., a, b, Name one device based on multiple reflection., a, b, What is the function of the retina?, a, b, How water scarcity is a global issue?, a, b, How can we save water?, a, b.

light

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排行榜

視覺風格

選項

切換範本

恢復自動保存: ?