A system administrator has created tty2 on a serial port connection to a system. When attempting to verify the connection the following error is observed： # cu -ml tty2 cu： 0835-028 The connection failed. NO DEVICES AVAILABLE. Which of the following should be performed to correct this error？（） ["Create an entry for tty2 in the \/etc\/uucp\/Devices file","Re-enter the command as "cu -dml tty2"","Create an entry for tty2 in the \/etc\/uucp\/Systems file","Re-enter the command as "cu -s 9600 -dh -t -l tty2""]
管理协调的原则是什么？
下列属于国际标准代号的是（） ["ANSI","DIN","ISO","JIS"]
新时期基础教育改革对教师专业发展提出什么要求和挑战？
怎样界定无效合同？无效合同怎样处理？
政府公共关系的主体是：（）、政府公共关系机构和政府公共关系人员。
