You executed the following command in the Recovery Manager (RMAN):RMAN> REPORT NEED BACKUP days 3;What is the output of this command?()A. A list of files that require a backup within 3 daysB. A list of files requiring more than 3 days of archivelogs to ap

题目
You executed the following command in the Recovery Manager (RMAN):RMAN> REPORT NEED BACKUP days 3;What is the output of this command?()

A. A list of files that require a backup within 3 days

B. A list of files requiring more than 3 days of archivelogs to apply

C. A list of files that RMAN recommends be backed up only once in every three days, based on low volatility

D. A list of files for which a backup as already been performed in the last three days and which is required to be backed up again based on the high number of transactions performed on them


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  • 第1题:

    窗体上有3个按钮Commandl、Command2和Command3,如以下代码: Private Sub Commandl Click() Command2.Enabled:Fal3e Command3.Vi3ible=Fal3e End Sub 该程序的功能是 ( )

    A.当单击按钮Command1时, Command2和Command3按钮不可用

    B.当单击按钮Command1时, Command2和Command3按钮不可见

    C.当单击按钮Command1时, Cammand2按钮不可用和Command3按钮不可见

    D.当单击按钮Command1时, Command2按钮不可见和Command3按钮不可用


    正确答案:C
    解析:本题主要是对命令按扭属性的考查。其中Enabled肩性用来表示按扭是否可用。Visible属性用来表示按扭是否可见。故选项C正确。

  • 第2题:

    窗体上添加有3个命令按钮,分别命名为Command1、Command2和Command3。编写Commandl的单击事件过程,完成的功能为:当单击按钮Command1时,按钮Command2可用,按钮Command3不可见。以下正确的是( )。

    A.Private Sub Command1_C1ick() Command2.Visible=True Command3.Visible=False End Sub

    B.Private Sub Commandl_C1ick() Command2.Enabled=True Command3.Enabled=False End Sub

    C.Private Sub Conunand1_C1ick() Command2.Enabled=True Command3.Visible=False End Sub

    D.Private Sub Command1_Click() Command2.Visible=True Command3.Enabled=False End Sub


    正确答案:C
    解析:命令按钮足否可见是由Visible属性来控制,是否可用由Enabled属性来控制。题目要求当单击按钮Command1时,按钮Command2.可用,也就是命令按钮Cored2的Enbaled届性为真:按钮Command3不可见,也就是命令按钮Command3的Visible属性为False,由此可见选项C是止确答案。

  • 第3题:

    窗体上添加有3个命令按钮,分别命名为.Command1、Command2和Command3。编写Command1的单击事件过程,完成的功能为:当单击按钮Command1时,按钮Command2可用,按钮Command3不可见。以下正确的是( )。

    A.Private Sub Command1_C1ick() Command2.Visible=Tme Command3.Visible=False EndSub

    B.Private Sub Command1 Click() Command2.Enabled=Tme Command3.Enabled=False EndSub

    C.Private Sub Command1_C1ick() Command2.Enabled=True Command3.Visible=False End Sub

    D.Private Sub Command1_Click() Command2.Visible=True Command3.Enabled=False End Sub


    正确答案:C
    解析:本题考查命令按钮控件的属性。命令按钮是否可见是由Visible属性来控制,是否可用是由Enabled属性来控制。题目要求当单击按钮Command1时,按钮Command2可用,也就是命令按钮Command2的Enbaled属性为真;按钮Command3不可见,也就是命令按钮Command3的Visible属性为False,由此可见选项C是正确答案,满足题目要求。

  • 第4题:

    窗体上添加有3个命令按钮,分别命名为Command1、Command2和Command3,编写Command1的单击事件过程,完成的功能为:当单击按钮Command1时,按钮 Command2可用,按钮Command3不可见。以下事件过程中正确的是( )。

    A.Private Sub Command 1 Click() Command2.Visible=True Command3.Visible=False End Sub

    B.Private Sub Command1 Click() Command2.Enabled=True Command3.Visible=False End Sub

    C.Private Sub Command1_Click() Command2.Enabled=True Command3.Visible=False End Sub

    D.Private Sub Command1 Click() Command2.Visible=True Command3.Enabled=False End Sub


    正确答案:C
    解析:本题考查控件的可见和可用属性韵知识,在 VBA中,要想使某个控件可用:则使其Enabled属性为Tree;要想使某个控件可见,则使其Visible属性为Tree。所以本题的正确答案为C。

  • 第5题:

    在窗体上画三个命令按钮,其名称分别为Command1、Command2和Command3,然后编写如下事件过程: Private Sub Command1 Click() Command2.Enabled = False Command3.Visible = False End Sub程序运行后,单击命令按钮Command1,则执行的操作是______。

    A.命令按钮Command2和Command3禁用

    B.命令按钮Command2和Command3隐藏

    C.命令按钮Command2隐藏,Command3禁用

    D.命令按钮Command2禁用,Command3隐藏


    正确答案:D

  • 第6题:

    3、command1 && comman2 || command3的含义是:()

    A.当command1,command2成功时才执行command3

    B.当command1,command2失败时才执行command3

    C.当command1失败,command2成功时才执行command3

    D.当command1成功,command2失败时才执行command3


    当 command1 成功, command2 失败时才执行 command3