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Why is the more diluted solution used for the assay of trimethoprim than that for sulfamethoxazole? 爲(wèi)何甲氧芐啶含量測(cè)定時(shí)供試液的稀釋倍數(shù)與磺胺甲惡唑測(cè)定時(shí)的要不同？