网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
VU指的是仪表风。（）
参考答案
更多 “VU指的是仪表风。（）” 相关考题
考题
关于仪表风系统，下列表述错误的一项是（）。A、仪表风系统就是为气动阀提供符合要求的控制气源B、干燥的压缩空气是仪表风系统唯一的控制气源C、仪表风系统排水的目的是为了保护精密仪表仪器，防止生锈腐蚀D、上位机通过控制编程，借助仪表风系统实现远程控制
考题
仪表工厂风系统工作流程如下（）A、进气→过滤→压缩→后冷却→油气分离→空气储存→工厂风用户→过滤→仪表风储存→仪表风用户B、进气→压缩→后冷却→油气分离→空气储存→工厂风用户→过滤→干燥→过滤→仪表风储存→仪表风用户C、进气→过滤→压缩→后冷却→空气储存→工厂风用户→过滤→干燥→过滤→仪表风储存→仪表风用户D、进气→过滤→压缩→后冷却→油气分离→空气储存→工厂风用户→过滤→干燥→过滤→仪表风储存→仪表风用户
考题
对仪表风系统描述错误的是（）A、仪表风系统可将空气进行压缩、过滤和干燥处理，使达到气动仪表及公用设施所需要的压力、湿度、温度等要求。B、仪表风经过干燥后生成更高一级的工厂风。C、仪表风压力低低开关报警将产生三级关停。D、仪表风系统可给仪器仪表及公用设施提供正确的、标准的、可用的压缩空气动力源
考题
单选题Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES,DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eliminate the need to qualify the view with the name MARY .EMP_DEP_LOC_VU each time the view is referenced? （）A
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.B
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.C
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary. EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.D
Scott cannot create a synonym because synonyms can be created only for tables.E
Scott cannot create any synonym for Mary's view. Mary should create a private synonym for the view and grant SELECT privilege on that synonym to Scott.
考题
单选题User Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She has the privilege to create a public synonym, and would like to create a synonym for this view that can be used by all users of the database.Which SQL statement can Mary use to accomplish that task?（）A
CREATE PUBLIC SYNONYM EDL_VU ON emp_dept_loc_vuB
CREATE PUBLIC SYNONYM EDL:VU FOR mary (emp_dept_loc_vu);C
CREATE PUBLIC SYNONYM EDL_VU FOR emp _dept_loc_vu;D
CREATE SYNONYM EDL_VU ON emp_dept_loc_vu FOR EACH USER;E
CREATE SYNONYM EDL_VU FOR EACH USER ON emp_dept_loc_vuF
CREATE PUBLIC SYNONYM EDL_VU ON emp_dept_loc_vu FOR ALL USERS;
考题
单选题Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view. Which option enables Scott to eliminate the need to qualify the view with the name MARY .EMP_DEP_LOC_VU each time the view is referenced?（）A
Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command: CREATE PRIVATE SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonymn.B
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU FOR mary.EMP_DEPT_LOC_VU; then he can prefix the columns with this synonym.C
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE LOCAL SYNONYM EDL_VU FOR mary.EMP DEPT_LOC_VU; then he can prefix the columns with this synonym.D
Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command: CREATE SYNONYM EDL_VU ON mary(EMP_DEPT_LOC_VU); then he can prefix the columns with this synonym.E
Scott cannot create a synonym because synonyms can be created only for tables.F
Scott cannot create any synonym for Mary’s view. Mary should create a private ynonym for the view and grant SELECT privilege on that synonym to Scott.
热门标签
最新试卷