Determination of tiamulin and valnemulin drug residues in aquatic products by ion exchange olid phase extraction-ultra performance liquid chromatography-tandem mass spectrometry(离子... di ZONGJingjing(宗婧婧), YANZhongyong(严忠雍), ZHANGXiaojun(张小军), LITingting(李停停), GAOXuehui(高学慧)

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