放射性核素标记HA大多是采用两步法（two-step procedure），即核素首 先标记到一种中间体上，然后再与载体结合。
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Engle-Granger Two-step Procedure 格兰杰两步法
two-step estimation procedure 两步估计法
two-step anodizing procedure 两步阳极过程
two-step hydrolysis procedure 二次水解法
two step regeneration procedure 两步再生法
two step hydrothermal procedure 两步水热法
two-step transformation procedure 两步转化法
a two step freezing procedure 二步冷冻法
two-step procedure
两步过程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This is a two-step procedure, starting with the naming of official suspects, which requires relatively little evidence, before progressing to a formal indictment if more conclusively damning evidence is found.
ECONOMIST: The McCann case
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