杂草有何经济意义？
贷款风险分类
具有一个枕骨髁的动物是（）。
某加工中心进行镗孔加工时，所镗出的孔与其基准的相互位置有误差，但未产生孔的形状误差，造成这种误差的原因很可能是（）。 机床的传动误差。 机床导轨的导向误差。 机床主轴的纯径向跳动。 机床主轴的纯轴向窜动。
Your network contains a single Active Directory domain named contoso.com. The functional level of the domain is Windows 2000 mixed. You have a domain controller named DC1 that runs Windows Server 2003 Service Pack 2 (SP2). DC1 hosts a standard primary zone for contoso.com. You need to ensure that only computers in the contoso.com domain can register host records in the contoso.com zone. What should you do?（） Convert contoso.com to a secondary zone.。 Convert contoso.com to an Active Directory-integrated zone. Set dynamic updates for the zone to Secure only.。 Convert contoso.com to an Active Directory-integrated zone. Set dynamic updates for the zone to Nonsecure and secure.。 Change the domain functional level to Windows Server 2003. Set dynamic updates for the zone to Nonsecure and secure.。
以太网上默认的OSPF Hello信息间隔时间是多少（）
