道路运输从业人员诚信考核和计分考核周期从初次领取驾驶证件之日起计算。
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系统中存在的、可能发生意外释放的能量或危险物质称作第二类危险源。（）
A. 正确
B. 错误
化脓性颌骨骨髓炎根据临床病理特点，病变始于颌骨骨松质和骨髓者称为（）
A. 边缘性骨髓炎
B. 放射性骨髓炎
C. 中央性骨髓炎
D. 婴幼儿上颌骨骨髓炎
E. 根尖周致密性骨炎
硅酸钙板属新一代“绿色”建材，在优良的防潮，防火性能基础上独具环保功能。主要成份和配方为（）。
A. 硅粉+天然原木纸浆纤维
B. 钙粉+天然原木纸浆纤维
C. 硅粉+钙粉
D. 硅粉+钙粉+天然原木纸浆纤维
You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. A new SQL Agent job has been created by you. The job includes a Windows PowerShell job step which transfer data between servers by using the SQLCmd utility. If the job fails, you must make sure that an operator named ReactGroup is informed by receiving an e-mail. So what action should you perform to achieve this goal? （）
A. First you should enable Notifications. Direct the Notification to the ReactGroup operator on job failure after you create the ReactGroup operator.
B. First you should enable Notifications. Direct the Notification to the ReactGroup operator on failure of the Powershell job step after you create the ReactGroup operator.
C. First you should assign the ReactGroup operator as the failCsafe operator. Then enable the job after you create the ReactGroup operator.
D. First you should configure the job step proxy account to use the ReactGroup operator account after you create the ReactGroup operator. At last choose the proxy account for the e-mail profile.
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