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1·RBAC model is the most popular access control strategy because of its flexibleness, convenience and security.

RBAC模型具有灵活性、方便性和安全性的特点，因此成为访问控制策略的首选。

2·The field experiments indicated that the intelligent measurement and control system has a good stability, robustness, and flexibleness.

经现场实验证明，研制的智能测控系统具有良好的稳定性、鲁棒性、灵活性。

3·The location of centroid is the one of important parameter of Solid Rocket Motor (SRM). It has important influence for the flexibleness of body, stability of running, safe of running and so on.

固体火箭发动机的质心位置是发动机的重要参数之一，对发动机的机动性、运行稳定性、运行安全性等都有着重要影响。