痕量残留
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The trace pesticide residue methyl-parathion was detected using SERS.
采用SERS的方法检测痕量农药残留甲基对硫磷分子。
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The contents of both REE and trace elements in the oil shale residue are higher than those in oil shale.
油页岩灰渣中稀土元素和微量元素富集度均高于油页岩。
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