A.变更取消仅邮件通知业务人员
B.提前发起变更申请确认变更时间
C.通知业务相关人员做好业务启停准备
D.提前准备好变更失败的回退操作
A.3次握手
B.端口机制
C.自动重发
D.滑动窗口协议
A、extrude
B、lathe
C、bevel
D、bevel profile
A、快捷检查
B、调度检查
C、基线管理
D、离线检查
A、SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)
FROM EMPLOYEES GROUP BY JOB_ID
HAVING AVG(SALARY) >3000;
B、SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)
FROM EMPLOYEES GROUP BY JOB_ID ,DEPARTMENT_ID
HAVING AVG(SALARY) >3000;
C、SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)
FROM EMPLOYEES GROUP BY AVG(SALARY)
HAVING AVG(SALARY) >3000;
D、SELECT JOB_ID , DEPARTMENT_ID , AVG(SALARY)
FROM EMPLOYEES GROUP BY JOB_ID , DEPARTMENT_ID
HAVING SALARY >3000;
A.传输层
B.网络层
C.LLC子层
D.MAC子层
A.PPP
B.POP3
C.P-TO-P
D.NEWS
A、Single
B、Active Time
C、Range
D、Frames
sequence生成策略是什么?
支持重绘(painting)的组件有哪些?
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