以v₀＝20m/s的速度竖直上抛一小球，经

A、Pa0/sub2/supsubno<60mHl.PaCO/sub2/supsubno>50mmlg

B、Pa0/sub2/supsubno<60mHgPaCO/sub2/supsubno<45mmg

C、Pa0/sub2/supsubno<60mmHgPaCO/sub2/supsubno>50mmH

D、Pa0/sub2/supsubno<60mHg、PaCO/sub2/supsubno<45mmHg

E、Pa0/sub2/supsubno<60mHg、PaC0/sub2supsubno45mmHg

有如下程序： Private Sub Command1 Click() Dim a As Single Dim b As Single a=5：b=4 Call S(a，B)End Sub Sub S(x As Single，y As Single) t=x x=t\y y=t Mod y End Sub 在调用运行上述程序后，a和b的值分别为

A．0 0

B．1 1

C．2 2

D．1 2

设有如下程序：

Private Sub Form_Click（）

Dim n As Integer, s As Integer

n = 8

s = 0

Do

s = s + n

n = n - 1

Loop While n > 0

Print s

End Sub

以上程序的功能是______。程序运行后，单击窗体，输出结果为______。

写出程序运行的结果

Public class Base

Public virtual string Hello() {return “Base”;}

Public class Sub:Base

Public override string Hello() {return “Sub”;}

1. Base b = new Base(); b.Hello;

2. Sub s = new Sub(); s.Hello;

3. Base b = new Sub (); b.Hello;

4. Sub s = new Base(); s.Hello;

下列程序运行后的输出结果是______。

Private Sub f(k，s)

s=1

For j=1 To k

s=s*j

Next

End Sub

Private Sub Command1_Click()

Sum=0

For i=1 To 3

Call f(i，s)

Sum=Sum+s

Next

Print Sum

End Sub

程序执行结果s的值是【 】.

Private Sub Command l-Click ()

I =0

Do

S= I +S

I = I + l

Loop Until I ＞=4

End Sub