正确答案: D
            特洛伊木马 
            题目:通过替换系统的合法程序,或者在合法程序中插入恶意代码,以实现非授权进程,从而达到某种特定目的。
             解析:解析:“特洛伊木马”简称木马,完整的木马程序一般由两个部分组成:一个是服务器程序,一个是控制器程序。木马通过替换系统的合法程序,或者在合法程序中插入恶意代码,以实现非授权进程,从而达到某种特定目的。
 
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                 [单选题]put computers to practical business use, but below the surface it is the heart of an(22) - the kernel - that provides the technical wizardry to juggle multiple programs, connect to networks and store(23).A traditional kernel provides all the functions for applications. The kernel(24) memory, I/O devices and parcels out processor time.The kernel also supports(25) and fault tolerance, which is the ability to recover automatically when parts of the system fail.
                                                
                  
                                                                                                                     Applications 
                                                                                                                                    
                
                
                            
                
                 [多选题]与A+A·B等价的逻辑表达式是______。(?、+、·分别表示逻辑异或、逻辑加、逻辑乘)
                                                
                  
                                                                                                                     A+B 
                                                                                                                                                                                          
                                            
                
                
                            
                
                 [单选题]●在Internet中,WWW服务的TCP标准端口号是 (28) 。(28) 
                                                
                  
                                                                                                                                                                                                             80 
                                            
                
                解析:【解析】在Internet中,WWW服务的TCP标准端口号是80。