假定有以下两个过程： Sub S1(ByVal x As Integer, ByVal y As Integer) Dim t As Integer t=K x=y y=t End Sub Sub S2(x As Integer, y As Integer) Dim t As Integer t=K x=y y=t End Sub 则以下说法中正确的是 ( )
D.用过程S1和S2都不能实现交换两个变量值的操作

未分类题执行语句Open'C: stu.dat'For Input As #2之后，系统 ( )A.将C盘当前文件夹下名为stu. dat的文件的内容读人内存B.在C盘当前文件夹下建立名为stu的顺序文件C.将内存数据存放在C盘当前文件夹下名为stu. dat的文件中D.将某个磁盘文件的内容写入C盘当前文件夹下名为stu. dat的文件中

单项选择题属于应用软件的一组是（）A. Windows 2000，WPS Office 2003，Word 2010B. UNIX，Visual FoxPro,AutoCADC. MS-DOS，学籍管理系统，财务软件D. Word 2010，Excel 2013，金山词霸

单项选择题婴儿最初社会性发生的标志是( )。 A、诱发性微笑的出现 B、不出声的笑 C、有差别的微笑的出现 D、出声的笑

未分类题Health implies. more than physical fitness. It also implies mental and emotional wellbeing. An angry, frustrated, emotionally (1)_____ person in good physical condition is not (2)_____ healthy. Mental health, therefore, has much to do (3)_____ how a person copes with the world as it exists. Many of the factors that (4)_____ physical health also affect mental and emotional well-being.Having a good self-image means that people have positive (5)_____ pictures and good positive feelings about themselves, about what they are capable (6)_____, and about the roles they play. People with good self-images like themselves, and they are (7)_____ like others. Having a good self- image is based (8)_____ a realistic (9)_____ of one's own worth and value and capabilities.Stress is an unavoidable, necessary, and potentially healthful (10)_____ of our society. People of all ages (11)_____ stress. Children begin to (12)_____ stress during prenatal development and during childbirth. Examples of stress-inducing (13)_____ in the life of a young person are death of a pet, pressure to (14)_____ academically, the divorce of parents, or joining a new youth group. The different ways in which individuals (15)_____ to stress may bring healthful or unhealthy results. One person experiencing a great deal of stress may function exceptionally well (16)_____ another may be unable to function at all. If stressful situations are continually encountered, the individual's physical, social, and mental health are eventually affecteD.Satisfying social relations are vital to (17)_____ mental and emotional health. It is believed that in order to (18)_____, develop, and maintain effective and fulfilling social relationships people must (19)_____ the ability to know and trust each other, understand each other, influence, and help each other. They must also be capable of (20)_____ conflicts in a constructive way.A.unstableB.unsureC.impreciseD.impractical

问答题在多缸工作的液压系统中，控制两个或两个以上的执行元件保持相同速度或相同位移运动的回路称为[填空]回路。