【毎日一問】工程基礎知識（選択問題）20200226
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基本要素に加えて、原油には微量の（A）元素も含まれている。 A、金属と非金属 B、硫黄 C、窒素 D、酸素
A、金属と非金属 B、硫黄 C、窒素 D、酸素
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