企业应当建立员工健康档案，质量管理、验收、库房管理等直接接触医疗器械岗位的人员，应当至少（）进行一次健康检查。身体条件不符合相应岗位特定要求的，不得从事相关工作。 每年。 二年。 三年。 四年。
发展援助
Which of the following types of attacks does DHCP snooping prevent？（Choose all that apply.）（） Attacker sends multiple DHCP requests flooding DHCP server。 Attacker connects rogue server initiating DHCP requests。 Attacker connects rogue server replying to DHCP requests。 Attacker sends DHCP jam signal causing DHCP server to crash。 Attacker sends gratuitous ARP replies， thereby jamming the DHCP server。 Attacker sends unsolicited DHCP replies， thereby jamming the DHCP server。
You are developing an application that runs by using the credentials of the end user. Only users who are members of the Administrator group get permission to run the application. You write the following security code to protect sensitive data within the application.bool isAdmin=false； WindowsBuiltInRole role=WindowsBuiltInRole.Administrator； ...... if（!isAdmin） throw new Exception（"User not permitted"）； You need to add a code segment to this security code to ensure that the application throws an exception if a user is not a member of the Administrator group. Which code segment should you use？（） A。 B。 C。 D。
燃煤（Ⅱ烟煤）蒸汽、热水锅炉最低热效率为（）。 A.65% 。 B.70% 。 C.75% 。 D.78%。
You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named Dworks in the instance. The Dworks database has a table named Orderthings. According to the company requirement, you have to export all data from the Orderthings table to a file. During the export, you must make sure that the data export process is saved for reuse and a Microsoft Office Open XML document format is used. What should you do?（）
