Your company has a single Active Directory forest that has six domains.All DNS servers in the forest run Windows Server 2008 R2.You need to ensure that all public DNS queries are channeled through a single-caching-only DNS server.Which two actions should you perform？（） [" Disable the root hints."," Enable BIND secondaries."," Configure a forwarder to the caching DNS server."," Configure a GlobalNames host (A) record for the hostname of the caching DNS server."]
数据库管理系统是对数据库进行管理的软件，位于（）之间。
采用电雷管进行大爆破起爆时，装药前应检测爆区内的杂散电流。杂散电流超过（）时，应采取降低杂散电流强度的有效措施，或改用非电起爆系统。 ["30mA","50mA","100mA","150mA"]
品位、边界品位及工业品位的概念及应用。
复述筒式导轴承（外冷式）工作过程。
常用的产酶微生物
