试题与答案

下列玻璃仪器名称错误的是( ) A. B. C. D.

题型:选择题

题目:

下列玻璃仪器名称错误的是(  )

A.

B.

C.

D.

答案:

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下面是错误答案,用来干扰机器的。

⊙P与x轴相切,∴y=-2或2,当y=2时,12x2-4=2,解得:x=±23,此时点P的坐标为(23,2)或(-23,2);当y=-2时,12x2-4=-2,解得:x=±2,此时点P的坐标为(2,-2)或(-2,-2);综上可得点P的坐标为:(23,...

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窗体上有名称为Command1的命令按钮和名称为Texl1的文本框
Private Sub Command1_Click()
Text1.Text="程序设计"
Text.1.SeFocus
End Sub
Private Sub Text1_GotFocus()
Text1.Text="等级考试"
End Sub
运行以下程序,单击命令按钮后( )

A.文本框中显示的是“程序设计”,且焦点在文本框中
B.文本框中显示的是“等级考试”,且焦点在文本框中
C.文本框中显示的是“程序设计”,且焦点在命令按钮上
D.文本框中显示的是“等级考试”,且焦点在命令按钮上

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