题目内容

高炉炼铁的本质是（）。

A. 铁的还原过程
B. 造渣
C. 脱硫

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Your company has a main office and a branch office.The network contains two DNS servers named DNS1 and DNS2.DNS1 is located in the main office. DNS1 hosts a primary standard zone named contoso.com. The contoso.com zone is configured to use DNSSEC.DNS2 is located in the branch office. DNS2 is a caching-only DNS server. You need to ensure that client computers in the branch office can receive authoritative responses to queries for contoso.com if a WAN link fails. DNSSEC security must be maintained.What should you configure on DNS2 for contoso.com？（）

A. a conditional forwarder
B. a secondary zone
C. a zone delegation
D. an Active Directory-integrated stub zone

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A. 信度
B. 效度
C. 区分度
D. 难度

确定药物的有毒无毒，主要考虑以下几方面（）

A. 含不含有毒成分
B. 整体是否有毒
C. 用量是否适当
D. 是否有副作用

滚子链传动的最主要参数是（）

A. 滚子外径
B. 销轴直径
C. 节距