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它为网络访问提供了第一层访问控制。
It provides the first layer access control for network access.
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整个控制系统由二级控制系统和二层通讯网络构成。
The control system has two level control system and two communication network.
youdao
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整个控制系统由二级控制系统和二层通讯网络构成。
The control system has two level control system and two communication network.
youdao