关于Y,yn0接线变压器的不平衡电流,说法正确的是()
A. 零线将出现零序电流,产生零序磁通,绕组中将感应出零序电动势,使中性点位移
B. 电流大的一相电压下降,其他两相电压上升
C. 规定零线电流不应超过变压器额定电流的40%
D. 当变压器的负荷接近额定值时,将使电流小的一相过负荷,电流大的一相负荷达不到额
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?()
A. Convert contoso.com to a secondary zone.
B. 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.
D. Change the domain functional level to Windows Server 2003. Set dynamic updates for the zone to Nonsecure and secure.