1, the provincial and national general publication knowledge network is generally included at around 600- 1500.
2, 1, provincial and national databases (VIP, Wanfang) are generally included at around 300- 1000.
3, 1, provincial and national academic journals CNKI is generally included in 800-2000 yuan.
In the dead of night, there is a hidden crisis; The sea is blue, but it contains danger; Datura flowers are beautiful, but full