Science
Junior High
なぜエとイなんですか?
) 茶わんの底に硬貨をおいて. 硬貨が見えなく】
に水を注ぐと, 硬人賀がうかんで見える。
光の進む道すしとしてふさわしいものを選び吉
の
ェーヽ
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なぜエとイなんですか?
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