by site短语⁵³⁹⁰³ 基本例句 通过网站 But, worryingly, none of those10 criteria were backed up by site data. 不过令人担忧的是，这10项标准中无任何一项有数据支持。 yeeyan Methods The BO mutants I402G and C457S were obtained by site-directed mutagenesis and confirmed by amino acid sequence analysis. 方法胆红素氧化酶突变体 I402G和 C457S通过聚合酶链反应获得，并经氨基酸序列测定加以证实。 cnki