space-time configurations, conservation laws, space physics 99.邮件系统的体系及应用 Application and Schemas for Mailbox System electronic mail, computer communication, data communication 00.码分多址 ode Division Multiple Access CDMA code division multiple access radiocommunication7 space-time configurations , conservation laws , space physics 99. 邮件系统的体系及应用 Application and Schemas for Mailbox System electronic mail , computer communication , data communication 100. 码分多址 Code Division Multiple Access CDMA , code division multiple access , radiocommunication