未分类 · 2025年11月21日

Gunpowder consists of a mixture of the following chemicals except ____________. ( ) A.potassium nitrate B.Silver C.sulfur D.charcoal

Gunpowder consists of a mixture of the following chemicals except ____________. ( ) A.potassium nitrate B.Silver C.sulfur D.charcoal

正确答案：B

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