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学堂乐歌的历史背景是什么？

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因吸入少量氯气、溴蒸气而中毒，可用碳酸氢钠溶液漱口，不可进行人工呼吸。

A. 正确
B. 错误

You are an enterprise administrator for Cer-tech .com. The corporate network of the company consists ofan Active Directory domain. All the servers on the network run Windows Server 2008. The network runsTerminal services to enable remote users to run commonly required applications from their terminal. A remote user logged on to the Terminal Server， required some help on the application he wanted to run.However，when you connect to the Terminal Server session，you cannot operate any applications. Which of the following options would you choose to ensure that you can assist any user on the Terminal Server？（）

A. From the Terminal Server， run the Chguserver /execute command and then reconnect to the session.
B. In the RDP-Tcp Properties on the Terminal Server， enable the Use remote control option with default user settings.
C. In the RDP-Tcp Properties on the Terminal Server， enable the Use remote control with the following settings option and then configure the Level of control policy setting to Interact with the session. Ask the user to log off and log back on.
D. From the Terminal Server， run the Tscon /v command and then reconnect to the session.

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下列关于工程变更的说法中正确的是（）。

A. 如果计划完整，工程变更可以避免
B. 工程变更一般包括设计变更、进度计划变更、施工条件变更等
C. 一旦出现变更，工程量、工期、成本不一定发生变化
D. 工程变更不能作为施工成本控制的依据

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准轨铁路运输，机车最大制动距离为（）m。

A. 250
B. 300
C. 350

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