DESIGN: Randomly double blind and control experiment.

设计：随机双盲对照实验。

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Double blind test was used in whole experiment.

整个实验采用双盲法。

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Double blind was used in the experiment.

整个实验采用双盲法。

youdao

Double blind was used in the experiment.

整个实验采用双盲法。

youdao