( )小王用掃把將打翻的鐵粉掃起來後，發現其中混合不少泥沙，請問他可以用何種方法分離出鐵粉？ (A)倒入水中後過濾 (B)使用蒸發皿加熱(C)利用磁鐵吸引 (D)置於水中自然沉澱。

問題詳情

21. ( )小王用掃把將打翻的鐵粉掃起來後，發現其中混合不少泥沙，請問他可以用何種方法分離出鐵粉？
(A)倒入水中後過濾
(B)使用蒸發皿加熱
(C)利用磁鐵吸引
(D)置於水中自然沉澱。

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