[Retracted] The Quality Evaluation and Knowledge System Construction of Hierarchical Teaching in the Curriculum Are Based on the Grey Association Method

<div>Example of hierarchical teaching.</div>

Wireless Communications and Mobile Computing

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Figure 2

Figure 2: [Retracted] The Quality Evaluation and Knowledge System Construction of Hierarchical Teaching in the Curriculum Are Based on the Grey Association Method 

Figure 2 | [Retracted] The Quality Evaluation and Knowledge System Construction of Hierarchical Teaching in the Curriculum Are Based on the Grey Association Method 