用公式QSMm=QS（1±XQS）估算与相对误差不确定度相应的带有误差限的输沙率的最大量值在“±”选择时取“-”号。
编写如下事件过程： Private sub sub1 (ByVal x1 As String, y1 As String) Dim xt As String Dim i As Integer i = Len(x1) Do While i＞= 1 xt = xt + Mid(x1, i, 1) i=i-1 Loop y1 = xt End Sub Private Sub Form. Click() Dim s1 As String, s2 As String s1= "teacher" sub1 s1, s2 Print s2 End Sub 程序运行后，单击窗体，则窗体上显示的内容是A．rehcaetB．tahreeeC．themeeD．eerthea
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写出程序运行的结果Public class BasePublic virtual string Hello() {return “Base”;}Public class Sub:BasePublic 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;
下面程序的输出结果是。 Private Sub Commandl_Click ch$=“ABCDEF” proc ch：Print ch End Sub Private Sub proc(ch As Stnng) s=“” For k=Len(ch) TO 1 Step -1 s=s&Mid(ch，k，1) Next k ch=s End Sub A．ABCDEF B．FEDCBA C．A D．F
在窗体中添加一个名称为Commandl的命令按钮，然后编写如下程序： Public x As Integer Private Sub Commandl_click() x＝10 Call s 1 Call s 2 MsgBOx x End Sub Pfivate Sub s1() x＝x+20 End Sub Private SubA．10B．30C．40D．50
下列程序的执行结果为 Private Sub Comrnandl_Click( ) Dim p As Integer, q As Integer p=12：q=20 Call Value(p, q) Print p; q End Sub Private Sub Value(ByVal m As Integer, ByVal n As Integer) m=m * 2: n=n - 5 Print m; n End SubA．20 12 20 15B．12 20 12 25C．24 15 12 20D．24 12 12 15
在窗体中添加一个名称为Command1的命令按钮，然后编写如下程序： Public x As Integer Private Sub Command1_Click() x=10 Call s1 Call s2 MsgBox x End Sub Private Sub sl() x=x+20 End Sub Private Sub s2() Dim x As Integer x=x+20 End Sub 窗体打开运行后，单击命令按钮，则消息框的输出结果为( )。A．10B．30C．40D．50
设有如下程序： char sub(char * q) {while(* q，＝'\0') {if(*q＞='A'&&*q＜＝'Z')*q＝* q+32; else if(*q＞＝'a' &&*q＜＝'z')*q=*q-32； printf("%c"，*q)； q++；} } main() {char *s="abcABC"； sub(s)； } 则程序运行后的输出结果是( )A．ABCabcB．abcABCC．abcabcD．ABCABC
