为给字符数组赋初值,下列语句中正确的是 (45) 。
A. char s1[]="abcdef";
B. char s2[4]="abcd";
C. char s3[2][3]="abc","xyz";
D. char s4[4][]=’a’,’x’,’s’,’t’;
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案例分析题计算机中的加、减运算常采用机器数的补码表示。已知二进制整数a=+100101,b=-11011,则a+b的补码表示是(),a-b的补码表示是()。 已知二进制整数a=+100101,b=-11011,则a+b的补码表示是()
A. 00001010
B. 11010101
C. 00001001
D. 10000001
案例分析题为了预防计算机病毒的感染,应当()。用硬件预防计算机病毒的方法主要是()。 为了预防计算机病毒的感染,应当()。
A. 经常让计算机晒太阳
B. 定期用高温对软盘消毒
C. 对操作者定期体检
D. 用抗病毒软件检查外来的软件
案例分析题The successful spread of a virus depends on how long it can () unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses () their code to avoid recognition. The successful spread of a virus depends on how long it can () unnoticed, before its presence is made known by the activation of side-effects.
A. move
B. replicate
C. backup
D. die out
案例分析题When you open a file or run a program in a computer, a window appears on the desktop of your computer. The () of the window indicates which program you are currently working in arid its color will become blue if a window is active. When you click on The () , the window disappears and appears as a button on the taskbar. Clicking on a button in () will invoke a specific command. The () of the window indicates which program you are currently working in arid its color will become blue if a window is active.
A. control menu
B. control bar
C. title menu
D. status bar