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【判断题】
三相半控桥式整流器电路电感性负载的控制角ɑ移相外围是0~90°()
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】在窗体上画一个名为Command1的命令按钮,然后编写以下程序: Private Sub Command1 Click( ) Dim a(10)As Integer Fork=10 To 1 Step-1 a(k)=20-2*k Next k k=k+7 Print a(k-a(k)) End Sub 运行程序,单击命令按钮,输出结果是( )。
A.
18
B.
12
C.
8
D.
6
【多选题】疫源地消灭的条件为:
A.
传染源被移走或不再携带病原体
B.
传染源散播外界环境的病原体被彻底消灭
C.
周围所有易感者经该病的最长传染期后不在发病
D.
周围所有易感者经该病的平均潜伏期后不在发病
E.
周围所有易感者经该病最长潜伏期后不在发病
【单选题】在窗体上画一个名为Command1的命令按钮和一个名为Text1的文本框,并把窗体的 KeyPreview 属性设置为True,然后编写如下代码: Dim SaveAll As String Private Sub Form_ Load () Show Text1.Text = ' ' TextSetFocus End Sub Private Sub Command1 Click() TextTe...
A.
abodefg
B.
不显示任何信息
C.
ABCDEFG
D.
出错
【单选题】在窗体上画一个名为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim Arr Arr = Array(1,2,3,4,5) j=1 For i = 5 To 1 Step -1 S = S + Art(i) * j j =j * 10 Next Print S End Sub 程序运行后,单击命令按钮,输出结...
A.
54321
B.
123
C.
12345
D.
345
【单选题】在窗体上画一个名为Command1的命令按钮,然后编写如下代码: Option Base 1 Private Sub Command1_ Click() Dim arr(4, 4) For i = 1 To 4 For j = 1 To 4 arr(i, j) = (i - 1) * 3 + j Next j Next i For i = 1 To 2 For j = 1 To 2 Print a...
A.
3 4 6 7
B.
7 8 10 11
C.
1 2 4 5
D.
8 9 12 13
【单选题】在窗体上画一个名为Command1的命令按钮,其Command1_Click事件过程如下: Sub Command1_Click() Dim student As studtype Dim record_no As Integer record_no=1 With student .ino=12 .strname='smith' .strsex='男' .smark=89 End With ___...
A.
Open 'c: /student.dat'For Input As #1 len(student)
B.
Open 'c: /student.dat'For random As #1 len(student)
C.
Open 'c: /student.dat'For Output As #1 len(student)
D.
Open 'c: /student.dat'For Append As #1 len(student)
【单选题】在窗体上画一个名为Command1的命令按钮,然后编写下列程序: Option Base 1 Private Sub Command1_Click() Dim Arr Arr=Array(1,2,3,4,5) j=1 For i=5 To 1 Step-1 S=S+Arr(i)*j j=j*10 Next Print S End Sub 程序运行后,单击命令按钮,输出结果是( )。
A.
54321
B.
123
C.
12345
D.
345
【单选题】在窗体上画一个名为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim Arr Arr=Array(1,2,3,4,5) j = 1 For i=5 To 1 Step-1 S=S+Arr(i)*j j=j*10 Next Print S End Sub 程序运行后,单击命令按钮,输出结果为( )。
A.
54321
B.
123
C.
12345
D.
345
【单选题】在窗体上画一个名为Command1的命令按钮,其Command1_Click事件过程如下。 Sub Command1_Click() Dim student As studtype Dim record_no As Integer record n=1 With student .ino=12 .strname='Smith' .strsex=“男” .smark=89 End With ____...
A.
Open'c:/student.dat'For Input As # 1 len=len(student)
B.
Open'c:/student.dat:For random As # 1 len=len(student)
C.
Open'c:/student.dat'For Output As # 1 len=len(student)
D.
Open'c:/student.dat'For Append As # 1 len=len(student)
【单选题】在窗体上画一个名为Command1的命令按钮,其Command1_Click事件过程如下: Sub Command1_Click() Dim student As studtype Dim record_no As Integer record_no=1 With student .ino=12 .strname='smith' .strsex='男' .smark=89 End With ___...
A.
Open'c:/student.dat'For Input As # 1 len=len(student)
B.
Open'c:/student.dat'For random As # 1 len=len(student)
C.
Open'c:/student.dat'For Output As # 1 len=len(student)
D.
Open'c:/student.dat'For Append As # 1 len=len(student)
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