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Advantages and disadvantages of 2 1 century network and subject network
2 1 century. com:

1. Advantages: There are many kinds of resources and comprehensive disciplines.

2. Disadvantages: Most resources of the whole station need to be downloaded for a fee.

3, subject network: advantages: primary school, junior high school, high school, complete subject version.

4. Disadvantages: Ordinary accounts have many rights and advanced accounts have many functions, so you need to purchase services.