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          幼兒園防地震ppt

          幼兒園防地震ppt

          這是幼兒園學習網網友上傳的《幼兒園防地震PPT》大全,歡迎各位網友前來學習下載。地震(英文:earthquake),又稱地動、地振動,是地殼快速釋放能量過程中造成的振動,期間會產生地震波的一種自然現象。

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