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二 に酸化 さんかケイ素 けいそでした
nisankakeisodeshita

敬
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Noun
, 
Desu Copula

The polite past form of 二酸化ケイ素

1. Was silicon dioxide.

Past/Perfective
, 
Polite
, 
Chemistry

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二酸化ケイ素でした

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