在40mLCO、CH4、N2的混合气体中,加入过量的空气,经燃烧后,测得体积缩减了42mL,生成CO236mL,气体中CH4的体积分数为()。
以下程序的运行结果是( ) #define MAX 10 int a[MAX],i; main() { printf("\n");sub1();sub3(A) ,sub2(),sub3(A) ; } sub2() { int a[MAX],i,max; max=5; for(i=0;i<max;i++)a[i]=i; } sub1() {for(i=0;i<MAX;i++)a[i]=i+i; } sub3(int a[]) { int i; for(i=0;i<MAX,i++)printf("%d",a[i]); printf("\n"); }A.0 2 4 6 8 10 12 14 16 18 0 1 2 3 4B.0 1 2 3 4 0 2 4 6 8 10 12 14 16 18C.0 1 2 3 4 5 6 7 8 9 0 1 2 3 4D.0 2 4 6 8 10 12 14 16 18 0 2 4 6 8 10 12 14 16 18
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在窗体上画一个名称为Command1的命令按钮,然后编写如下事件过程: Private Sub Command1 Click() a = 2 For i=1 To 3 Call funl(i,A)Next i x = i + 2 Print x;a End Sub Private Sub fun1(n,m) m=m + n * 2 n = n + m End Sub 程序运行后,单击命令按钮,则窗体上显示的内容是A.1 5B.4 5C.8 4D.3 4
在窗体中添加一个命令按钮,编写如下程序: Private Sub Subl(p,m,n) p=p+1:m=m+1:n=n+1 Print"subl:";p;m;n End Sub Private Sub Command1_Click() al=1:b=2:c1=3 Call Subl(a,b1+3,c1) Print"Main:";a1;b1;c1 End Sub 程序运行后,输出结果为A.Sub:2 6 4 Main:2 6 4B.Sub:2 6 4 Main:2 6 4C.Sub:2 6 4 Main:1 2 3D.Sub:2 6 4 Main:2 2 3
有如下程序: Private Sub Command1_Click() Dim a As Single Dim b As Single a=5:b=4 Call Sub1(a,b) End Sub Sub Sub1(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 0B. 1 1C.2 2D.1 2
若有以下变量和函数说明:includecharCh='*';void sub(int x,int y,char ch,double*若有以下变量和函数说明: #include<iostream.h> charCh='*'; void sub(int x,int y,char ch,double*Z) { switch(ch) { case'+':*Z=x+y;break; case'-':*Z=x-y;break: case'*':*Z=x*y;break; case'/':*z=x/y;break: } } 以下合法的函数调用语句是( )。A.sub(10,20,Ch,y);B.sub(1.2+3,2*2,'+',&Z);C.sub(sub(1,2,'+',&y),sub(3,4'+',&x),'-',&y);D.sub(a,b,&x,ch);
有如下一个Sub过程: Sub mlt(ParamArray numbers()) n=1 For Each x In numbers n=n*x Next x Print n End Sub 在一个事件过程中如下调用该Sub过程: Private Sub Command1_Click() Dim a As Integer Dim b As Integer Dim c As Integer Dim d As Integer a=1 b=2 c=3 d=4 mlt a,b,c,d End Sub 该程序的运行结果为( )。A.12B.24C.36D.48
窗体上画一个名称为Text1的文本框,然后编写如下事件过程: Private Sub Form. Load() Show TextSetFocus End Sub Private Sub Text1_ KeyPress (KeyAscii As Integer) Dim ch As String ch = Chr (KeyAscii) KeyAscii = Asc(UCase(ch)) Pint Chr(KeyAscii + 4) End Sub程序运行后,在文本框中输入abcde,则在窗体上显示的内容是______。A.abcdeB.efghiC.EFGHID.ABCDE