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食品安全法第二十七条规定的“五防”是指防腐、（）、（）、（）、（）。

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《铁路旅客运输管理规则》要求，听旅客讲话时应认真倾听，不得随意打断。

A. 正确
B. 错误

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货车车身总成大修送修标志是（）严重锈蚀腐朽、破损变形，需要彻底修复。

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检查穴距、每穴下种粒数和漏播率时，每个测点长度不应少于规定穴距的（）

A. 1倍
B. 2倍
C. 3倍
D. 4倍

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Your company has a single active directory domain named contoso.com. all servers run windows server 2008. You have a public DNS server named server1, and an e-mail server named server2. Client computers outside the company domain are unable to send e-mail messages to contoso.com. you verify that the host (A) DNS record for server2 is available to external client computers. You need to ensure server2 can receive e-mail messages from external client computers. How should you configure the contoso.com DNS zone?（）

Add a mail exchange (MX) record for server2.
B. Add a mailbox (MB) record for server2. Set the mailbox host setting to server2.
C. Add a canonical (CNAME) record that maps server2 to contoso.com.
D. Add a server locator (SRV) record for server2. Set the service field to _smtp. Set the protocol field to _tcp. Set the port number to 25.

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