题目内容

PN结加反向电压（数值小于击穿电压）时：（）。

A. 空间电荷区变宽，漂移运动大于扩散运动
B. 空间电荷区变窄，漂移运动大于扩散运动
C. 空间电荷区变窄，扩散运动大于漂移运动
D. 空间电荷区变宽，扩散运动大于漂移运动

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You are creating a Windows Forms Application by using the .NET Framework 3.5.Your applciation will be used by a government depertment.You need to ensure that the application meets "accessibilty" requirements.Which three actions should you perform？（）

A. Expose keyboard focus visually and programmatically.
B. Use the NeutralResourceLanguageAttribute attribute in the assembly.
C. Provide documented keyboard access to all application features.
D. Set all the colors to primary colors when the high contrast mode is on.
E. Display all user interface elements by using the system color scheme when high contrast mode is off.
F. Either display all visual cues or create sound effects for any information.

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