在CAD中取消命令执行的键是( )A. 按回车键 B. 按空格键C. 按ESC键D. 按F1键……

未分类题It is estimated that some seven hundred million people about half of the world's population are unable to read and write, and there are probably two hundred and fifty million more people whose level of attainment is so slight that it barely outlives a literacy.Recently the attack on illiteracy(文盲)has been stepped up. A world plan has been drawn up by a committee of UNESCO experts in Paris, as part of the United Nations Development Decade, and an international conference on the subject has the aim. People must learn the basic skills of responsible citizenship: the ability to read notices, newspapers, timetables, letters, pricelists, to keep simple records and accounts, to sort out the significance of the information gathered, and to fill in forms.The major areas of illiteracy are in Asia, Africa, and Central and South AmericA.In Africa there are at least one hundred million illiterates, compromising(牵连)eighty to eighty-five per cent of the total population. In Europe the figure is about twenty-four million, most of them in Southern Europe, with Spain, Italy, Portugal, and Yugoslavia heading the list (the United Kingdom has about seven hundred thousand).Studying carefully the clues in the passage, we learn that the total population of Africa is ______.A.approximately seven hundred millionB.approximately one hundred and twenty-five millionC.approximately eight or eight point five thousand millionD.exactly twenty-four million

单项选择题‏有关正中神经，描述不正确的是​

未分类题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() Static y As Integer Cls For i=0 To 2 x=x+y y=y+3 Next Print x,y End Sub 程序运行后，连续二次单击Command1按钮后，窗体上显示的是______。A.9 9B.36 18C.30 12D.63 27

未分类题在窗体上画一个命令按钮，然后编写如下事件过程： Private Sub Command1_Click() x=0 Do Until x=-1 a=InputBox('请输入A的值') a=Val(A) b=InputBox('请输入B的值') b=Val(B) x=InputBox('请输入x的值') x=Val(x) a=a+b+x Loop Print a End Sub 程序运行后，单击命令按钮，依次在输入对话框中输入5、4、3、2、1、-1，则输出结果为______。D.15

问答题根据图中的尺寸画图，按以下要求提取数据，并填空。 注意： 两个答案之间用分号隔开（中英文分号均可，注意不用带空格）。 数值四舍五入取整数，不要带单位。 （1）淡黄色区域的面积为（ ）mm2。 （2）图示距离为（ ）mm。

未分类题在窗体上画一个文本框，然后编写如下事件过程： Private Sub Text1_KeyPress(KeyAscii As Integer) Dim char As String char=Chr(KeyAscii) KeyAscii=Asc(UCase(char)) TextText=String(6, KeyAscii) End Sub 程序运行后，如果在键盘上输入字母“a”，则文本框中显示的内容为______。D.AAAAAAA

未分类题编写如下事件过程： Private Sub Form_KeyDown(KeyCode AS Integer，Shift As Integer) If(Button And 3)=3 Then Print 'AAAA' End If End Sub 程序运行后，为了在窗体上输出“AAAA”，应按下的鼠标键为______。D.按什么键都不显示

未分类题数据库设计中，用E－R图来描述信息结构但不涉及信息在计算机中的表示，它属于数据库设计的D.物理设计阶段

单项选择题分组交换网为了能正确地将用户的数据包传输到目的地计算机，数据包中至少包含________。 A、包的源地址 B、包的目的地地址 C、MAC地址 D、下一个交换机的地址

未分类题The word 'suggest' in Paragraph 10 could be best replaced byD.explain.