Your company, Contoso, Ltd., has a main office and a branch office. The offices are connected by a WAN link. Contoso has an Active Directory forest that contains a single domain named ad.contoso.com. The ad.contoso.com domain contains one domain controller named DC1 that is located in the main office. DC1 is configured as a DNS server for the ad.contoso.com DNS zone. This zone is configured as a standard primary zone. You install a new domain controller named DC2 in the branch office. You install DNS on DC2. You need to ensure that the DNS service can update records and resolve DNS queries in the event that a WAN link fails. What should you do（） ["Create a new stub zone named ad.contoso.com on DC2.","Configure the DNS server on DC2 to forward requests to DC1.","Create a new secondary zone named ad.contoso.com on DC2.","Convert the ad.contoso.com zone on DC1 to an Active Directory-integrated zone."]
保兑行是在开证行无力付款时才履行付款责任的，所以保兑行的付款责任是第二性的。
7～8个月的婴儿适应周围人物的能力和行为表现为（）。 ["对人和事物有爱憎之分，用手示意表示需要，穿衣能合作","表示大、小便要求，理解成人简单指令，开始学自己用匙喂食","表示自己意见（同意或不同意），会用杯喝水","听懂自己名字，自握饼干吃"]
国家建立医疗器械质量事故报告制度和医疗器械质量事故公告制度。具体办法由国务院药品监督管理部门会同国务院（）制定。 ["质量技术监督部门","卫生行政管理部门","工商行政管理部门","计划生育行政管理部门"]
脲酶抑制剂在农业生产的应用有哪些（） ["提高尿素的利用率","延长肥效期","提高氮肥的利用效果","防止果蔬制品褐变","可以抗病抗虫"]
允许信号同时在两个方向上流动的数据传输方式叫做（）。
