单项选择题

以下( )不属于对象的基本特征。

A.继承性
B.封装性
C.分类性
D.多态性
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单项选择题

设在工程中有一个标准模块,并定义了如下类型: Type Stutype ino As Integer stmame As String*20 strsex As String*2 smark As Single End Type 在窗体上画一个名为Command1的命令按钮,要求当执行事件过程Command1_Click时,在C盘根目录下的随机文件Student.dat中写入一条记录。下列能够完成该操作的是( )。

A.Sub Command1_Click() Dim student As Studtype Dim record_no As Integer record_no=1 With student .ino=12:.stmame="smith": .strsex==男=:.smark=89 End With Open"c:\Student.dat"For Input As#1 Len =Len(Student) Put#1,record_no,Student Close#1 End Sub
B.Sub Command1_Click() Dim Student As Stutype Dim Record_no As Integer Record_no=1 With Student .ino=12:.strname="smith" .strsex="男":.smark=89 End With Open"c:\student.dat"For RandomAs As#1 Len=Len(Student) put#1,Record_no,Student Close#1 End Sub
C.Private Sub Command1_Click() DimStudent As Stutype Dim Record no As Integer Record_no=1 With Student .ino=12:.stmame="smith" .strsex="男":.smark=89 End With Open"c:\student.dat"For Random As 1 Len=Len(Student) Write#1,Record_no,Student Close#1 End Sub
D.Sub Command1_Click() Dim Student As Stutype Dim Record_no As Integer Record_no=1 With Student .ino=12:.stmame="smith" .strsex="男":.smark=89 End With Open"c:\student.dat"For Output As#1 Len=Len(Student) Put#1,Record_no,Student Close#1 End Sub
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