按化学结构分类，美沙酮（Methadone）属于
按化学结构分类，美沙酮（Methadone）属于
The potency of morphine is less than that of A: meperidine B: sufentanil C: codeine D: methadone
The potency of morphine is less than that of A: meperidine B: sufentanil C: codeine D: methadone
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