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信号阀的安装要求是什么？

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You have a DHCP server that runs Windows Server 2008 R2. The DHCP server has two network connections named LAN1 and LAN2.You need to prevent the DHCP server from responding to DHCP client requests on LAN2. The server must continue to respond to non-DHCP client requests on LAN2. What should you do？（）

A. From the DHCP snap-in, modify the bindings to associate only LAN1 with the DHCP service.
B. From the DHCP snap-in, create a new multicast scope.
C. From the properties of the LAN1 network connection, set the metric value to 1.
D. From the properties of the LAN2 network connection, set the metric value to 1.

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科学中的革命精神重心在于（）。

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科学哲学家波普尔认为，科学始于（）。

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综合冶炼强度是指每立方米高炉有效容积每昼夜消耗的焦炭量。

A. 正确
B. 错误

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