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刮板输送机刮板链飘链有何原因？

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You have a server that runs Windows Server 2003 Service Pack 2 (SP2). The server connects to the Internet by using a router.You attempt to launch Windows Update and receive the following error message: “Cannot find server or DNS Error.”The IP configurations of the server are shown in the exhibit. (Click the Exhibit button.)ou need to ensure that the server can connect to Windows Update. What should you do?（）

A. Configure the server to have static IP settings.
B. Install the DNS Server service on Server1 and configure DNS to use a forwarder.
C. Add an entry to the %systemroot%\system32\drivers\etc\hosts file for update.microsoft.com.
D. Add an entry to the %systemroot%\system32\drivers\etc\lmhosts file for update.microsoft.com.

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外币期货是指合同规定在将来某一指定月份买进或卖出规定金额的外币。

A. 正确
B. 错误

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低压电缆与控制电缆及高压电缆应分开敷设。当需要明敷时，其净宽距离不应小于（）。

A. 100mm
B. 150mm
C. 200mm
D. 250mm

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在尺寸链中，当其它组成环不变时，该组成环尺寸增大时封闭环随之减小，则该环为减环。

A. 正确
B. 错误

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