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光周期现象是（）和（）在研究日照时数对美洲烟草（马里兰猛象）开花的影响时发现的。

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原则上第三方用户接入区内应统一部署第三方人员专用终端，并安装必要的杀毒软件和统一终端访问控制，严禁安装与工作无关软件，禁止（）的直接接入。所有区域设备严禁安装双网卡，不得私设无线网络。

A. 外部移动终端
B. 无线网络
C. 办公网络
D. 移动存储介质

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当系统将单车识别为两辆车时，正确做法为（）

A. 使用牵引键证
B. 合并称重信息
C. 删除一条称重信息
D. 补费

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When entering from seaward，a buoy displaying a single-flashing red light would indicate （）.

A. a junction with the preferred channel to the left
B. a sharp turn in the channel to the right
C. the starboard side of the channel
D. a wreck to be left on the vessel's port side

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You are creating a Windows Forms application for a financial service provider by using the .NET Framework 3.5. You have to implement a multiple document interface （MDI） in the application to allow users to open multiple financial documents simultaneously.You need to ensure that whenever the child MDI form is created， the application displays a message in the title bar of the parent MDI that a child form has received focus. What should you do？（）

A. Implement theActivated event
B. Implement the MdiChildActivate event
C. Override the OnParentVisibleChanged method
D. Override the OnParentBindingContextChanged method

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