In chapter 2, the gas chromatographic separation condition of several natural and synthetic estrogens was optimized.SPE as a pretreatment method, the estrogens in river water were determined.是什么意思_In chapter 2, the gas chromatographic separation condition of several natural and synthetic estrogens was optimized.SPE as a pretreatment method, the estrogens in river water were determined.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句