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帧同步系统中为什么要加前、后方保护电路？

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在物流业场景中，有哪些基于无线技术的新应用？（）

A. 无线电子秤
B. 交易一体机接入
C. RFID射频无线扫描

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液氯工段内严禁（）（包括外来人员），以免发生危险。

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The corporate network of Certkiller consists of a Windows Server 2008 single Active Directory domain. The domain has two servers named Certkiller 1 and Certkiller 2. To ensure central monitoring of events you decided to collect all the events on one server， Certkiller 1. To collect events from Certkiller 2. and transfer them to Certkiller 1， you configured the required event subscriptions. You selected the Normal option for the Event delivery optimization setting by using the HTTP protocol. However， you discovered that none of the subscriptions work. Which of the following actions would you perform to configure the event collection and event forwarding on the two servers（）

A. Through Run window execute the winrm quickconfig command on Certkiller 2.
B. Through Run window execute the wecutil qc command on Certkiller 2.
C. Add the Certkiller 1 account to the Administrators group on Certkiller 2.
D. Through Run window execute the winrm quickconfig command on Certkiller 1.
E. Add the Certkiller 2 account to the Administrators group on Certkiller 1.
F. Through Run window execute the wecutil qc command on Certkiller 1.

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恢复通风前，压入式局部通风机及其开关附近（）以内风流中瓦斯浓度都不超过0．5％时，方可人工开启局部通风机。

A. 10m
B. 15m
C. 20m
D. 25m

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