You work as a database administrator for Supportcenter.cn. While granting a role, SELECT_CATALOG_ROLE, to a user, SupportCenter, using Oracle Enterprise Manager 10g Database Control, you have cleared the DEFAULT check box. What will be the result?() The user cannot use the role at all.。 The role would not be granted to the user.。 The user needs to enable the role explicitly.。 The user can start using the role immediately.。 The user would have the admin option for the role.。
假山分层施工工艺流程
You are working in an online transaction processing (OLTP) environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command, the System Change Number (SCN) was 663571. After flashing back the CUSTOMERS table,you realize that the table is not in the correct state and the resultant changes are not what you had desired. So, you need to reverse the effects of the FLASHBACK TABLE command while ensuring that: a) No other user data in the database is affected. b) The operation takes the minimum possible time. Which option would you choose?() use the ROLLBACK command with SCN 663571。 perform Flashback Transaction Query with SCN 663571。 execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571。 execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571。
在选择动火作业点时,要求不正确的是() 动火点上方没有高压线。 地下没有通信光缆。 管道椭圆度误差不超过管外径的2%。 具备施工条件。
某办公楼幕墙工程28层,正立面为单元式玻璃幕墙5600m2,其他部位为石材12000m2和金属幕墙4700m2、明框玻璃幕墙6000m2,采用钢化中空玻璃,幕墙的开启扇采用隐框玻璃上悬窗。
施工过程中,发生了如下事件:
事件一:单元式玻璃组件采用之江牌硅酮结构密封胶。安装过程中金属扣盖采用白云牌硅酮耐候密封胶。层问防火封堵采用白云牌硅酮耐候密封胶。避雷接地每4层做均压环与连接主体接地体有效连接。
事件二:玻璃幕墙工程质量验收划分为11个检验批,每个检验批每500m2抽查一处,每处1Om2。检测报告的石材弯曲强度为7.OMPa,吸水率为1%。石材幕墙采用的铝合金挂件厚度为3.Omm。监理工程师认为存在错误,责令整改。石材的弯曲强度和吸水率应为多少?石材幕墙采用铝合金挂件厚度正确应为多少?
【背景资料】某工业厂房车间3层,7度抗震设防。高度20m,长度为70m,独立基础,结构形式为砌体承重结构。在建成使用几个月后发现底层局部地面呈锅底形下沉,砼地面脱落、开裂,后来又发生墙体开裂,裂缝呈正八字裂缝和斜向裂缝,裂缝宽度达1mm~2mm,一般分布在底层中下部,且首先在窗对角突破,严重影响了建筑物的使用和工厂面貌,给工厂造成了重大的经济损失。经翻阅资料发现,该仓房实际上处于软弱土层,且为淤泥质土,地勘报告不准确;最终认定是由于地面不均匀沉降造成的危害
对于施工阶段沉降观测,主体封顶后,必须按()1次的频率进行观测。