试题与答案

在运行表单时,下列有关表单事件引发次序的叙述正确的是( )。A.Activate

题型:单项选择题

题目:

在运行表单时,下列有关表单事件引发次序的叙述正确的是( )。

A.Activate→Init→Load

B.Load→Activate→Init

C.Activate→Load→Init

D.Load→Init→Activate

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 数据库设计主要分四个步骤;需求分析,概念结构设计,逻辑结构设计,物理结构设计。 选项B错误,应为所选,因为概念结构设计在需求分析的基础上对客观世界做抽象,独立于数据库的逻辑结构;...

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B.Banana pie.

C.Apple pie.

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题型:选择题

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色光绿
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临界角41.37°41.34°41.25°41.17°40.88°40.75°
在入射角α逐渐减小到零的过程中,光屏上彩色光带的变化情况是

A.紫光最先消失,最后只剩橙、红光

B.紫光最先消失,最后只剩黄、橙、红光

C.红光最先消失,最后只剩紫、蓝光

D.红光最先消失,最后只剩紫、蓝、绿光

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