It gives the graded control strategy and blackboard structure is adopted.

给出了分级控制策略，并引入了分级、分层的黑板结构。

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Of uniform leadership and graded control with regard to price control matters.

第四条国家对价格工作实行统一领导、级管理。

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The other group served as a control, and their questions were carefully graded by the experimenter.

另外的组充当控制组，他们的答案也会被实验者进行仔细地评分。

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