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窒化 ちっかケイ素 けいそでした
chikkakeisodeshita

敬
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Noun
, 
Desu Copula

The polite past form of 窒化ケイ素

1. Was silicon nitride.

Past/Perfective
, 
Polite
, 
Chemistry

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窒化ケイ素でした

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