Based on the study of vulnerability information system, point out the limitation of access control mechanism.

深入分析脆弱性信息系统研究现状，指出现有脆弱性信息系统访问控制机制的不足之处。

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In France, the limitation on access to jobs, the employers' tax and work permit requirement have been barriers applying to those two EU countries but not others in the 27-nation bloc.

BBC: French government eases job access for Roma