What does the semicolon mean in the references of the paper?

Not a semicolon, but a separator,

References:

[1] Wang Lianchang's Administrative Law of Ma Huaide. Beijing: China University of Political Science and Law Press, 2002. 157.

......

[12] kong, government assistance obligations in a harmonious society, administration and law, 2005, 9: 12.

[13] Zhang's "Minimum Living Security System" and its Practice and Exploration in Chongqing, 200 1, 5: 124.

September 2005: 12 No.912.

200 1, 5: 124, issue 5, page 124.

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First, the understanding of their posts:

What are the evaluation conditions for intermediate professional titles in Nanjing?