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

粒子系统中创建的场景可以不使用动画记录钮而被直接记录和播放。()

sequence生成策略是什么?