addstr = "发现端口" & Str(port) & "打开" & Space(5) Select Case port Case 7 plus = "ECHO服务" Case 21 plus = "FTP服务★★★★★" Case 25 plus = "SMTP服务★★" Case 43 plus = "Whois服务" Case 53 plus = "DNS服务☆" Case 80 plus = "HTTP服务★★★★★" Case 81 plus = "HOSTS2名称服务" Cas
Contents Preface to the Third Edition, vii Preface to the Second Edition, ix Preface to the First Edition, xi Preliminaries, 1 Part 1: Preliminaries, 1 Part 2: Algebraic Structures, 17 Part I---Basic Linear Algebra, 33 1 Vector Spaces, 35 Vector Spa