low dose lead ( 5 4 mg / L PbAc , by drinking );

低浓度铅（54mg/L，饮水）染毒组；

This exercise , he said , had demonstrated the need for the PBAC to provide more timely access to information .

他指出：这也说明PBAC应该及时的发布更多的审批信息。

As a solution , policy-based access control ( PBAC ) model is proposed to be the foundation of the research .

并介绍了基于策略的访问控制模型（PBAC），该模型是本文后续研究的基础。

But after re-evaluating the proposal , under pressure from the government , the PBAC gave its approval to the revised program .

但是在政府的压力下，PBAC重新评估了这份建议，并最终批准通过了这项修订计划。

To guarantee the information security in information acquisition and management in enterprises , an Policy-Based Access Control ( PBAC ) model was proposed .

为了保障企业在获取和处理信息时的信息安全性，需要建立一套信息访问控制机制。