说明：  面向连接的学生信息及成绩查询系统.功能需求：根据套接字编程知识，采用面向连接TCP协议，实现服务器端存储学生基本信息和成绩信息，用户可通过客户端输入查询学生和成绩信息
(Student achievement information and connection-oriented query system functional requirements: According to socket programming knowledge, using the connection-oriented TCP protocol, the server-side storage students basic information and performance information, the user can enter a query and achievements of students through the client information)