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【单选题】
Your company has a domain controller named Server1 that runs Windows Server 2008 R2 and the DNS server role. A server named Server2 runs Windows Server 2003 and Microsoft Exchange Server 2007.The company wants to deploy a new Exchange server named Server3 to receive all inbound e-mail traffic.You need to configure DNS to direct incoming e-mail traffic to the Exchange servers. You also need to ensure that higher priority is given to Server3.What should you do？（）A.
Set the priority value of the Server2 Mail Exchanger (MX) record to 20. Create a new Mail Exchanger(MX) record for Server3. Set the priority value to 5.
B.
Set the priority value of the Server2 Mail Exchanger (MX) record to 5. Create a new Mail Exchanger(MX) record for Server3. Set the priority value to 20.
C.
Create a new Service Location (SRV) record in the domain for Server3. Set the port number value to 25. Configure the priority setting to 20.
D.
Create a new Service Location (SRV) record in the domain for Server3. Set the port number value to 110. Configure the priority setting to 5.
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举一反三
【简答题】（）是门禁系统的核心部分，是门禁系统的灵魂。
【简答题】根据铁水成分的不同和对所炼钢种的要求,氧气顶吹转炉造渣方法可以分为单渣法、 ( )和( )三种。
【单选题】以下描述错误的是
A.
老年人禁用含金刚烷胺的复方抗感冒药。
B.
严重高血压、心功能不全、心绞痛患者禁用含有伪麻黄碱成分的感冒药。
C.
氯苯那敏和苯海拉明有轻微的抗胆碱作用，可能会引起眼压升高、尿潴留等不良反应，患有青光眼、前列腺增生、甲亢等的患者应慎用含有此类成分的感冒药。
D.
对乙酰氨基酚缓释片说明书标注“肝肾功能不全者禁用”。
【简答题】什么是门禁系统，地铁车站哪些地方应设门禁系统？