A. 内容                                                      B. 整体风格

C. 显示格式                                               D. 构图方法

17. 下列操作系统中 不属于网络操作系统的是 (       )

A.UNIX                                                   B.Windows 98

C.Windows NT                                        D.Linux

18. 不属于 网络安全协议的是 (       )

A.SSL                                                     B.SET

C.S-HTTP                                               D.HTTP

19. 保证电子商务完全和公正的机构是 (       )

A.ISP                                                             B.ICP

C.NSP                                                            D.CA