The pass percent of the water quality after sewage treatment in Weigang Combination Station in 2003is only70%, which forms the severe threat on the stratum layer' s safety.

2003年，魏岗联合站污水处理水质合格率只有70%，严重影响到魏岗油田注水合格率，对地层安全形成了极大的威胁。

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For instance, the policies for basic field coverage, users' authentication and base station configurations can be enforced at Layer 1.

例如，可在第1层执行基域覆盖策略、用户鉴别策略以及基站配置策略等。

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MAC address filtering and base station discovery policies that prevent the deployment of unauthorized access points and other wireless devices can be enforced at the final layer.

而在最后一层则可执行那些用来防止未经授权的访问点以及其它无线设备配置的MAC地址过滤和基站发现策略。

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