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elemental composition
agric. 元素组成
eng.geol. 元素成分
met. 元素成分组 成; 化学成分组成; 元素成分〔组成〕; 化学成分〔组成〕; 元素组成〔成分〕; 化学组成〔成分〕; 化学成分 (组成); 元素成分 (组成)
sol.pow. 构成的化学元素

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