根据《合同法》的规定，要约失效的原因主要是（）。 拒绝要约的通知到达要约人。 要约人依法撤回要约。 承诺期限届满，受要约人作出承诺。 受要约人对要约的内容作出实质性变更。
变压器有哪些主要部件？
What are some of the characteristics of the OSPF routing protocol?（） It confines network instability to a single area of network.。 It increases the routing overhead of the network。 It supports VLSM。 It routes between Autonomous Systems.。 It allows extensive control of routing updates。 None of the above。
党员干部买卖股票或者进行其他证券投资，违反了党的廉洁纪律。
You are the network administrator for the Beijing office of TestKing. A branch office is located in Cairo. The DNS servers in both locations run Windows Server 2003. The network uses two DNS namespaces internally. They are named publishing.testking.com and testking.com. The locations of the primary name servers are shown in the following table. The Beijing office contains some servers that are registered in the testking.com zone and other that are registered in the publishing.testking.com zone. All computers in the Beijing office are configured to use the local DNS server as their preferred DNS server. The two offices are connected only by using a VPN through the Internet. Various network problems occasionally result in loss of connectivity between the two offices. Firewalls prevent the DNS servers in both offices from receiving queries from the Internet. You need to configure the DNS server in the Beijing office to allow successful resolution of all queries from the Beijing office for names in the publishing.testking.com namespace, even when the VPN link between the Beijing and Cairo offices fails. What should you configure on the DNS server in the Beijing office?（） In the testking.com zone, create a delegated subdomain named publishing. Specify the DNS server in the Cairo office as a name server.。 Create a secondary zone name publishing.testking.com. Specify the DNS server in the Cairo office as a master server.。 Configure conditional forwarding for the publishing.testking.com namespace. Specify the DNS server in the Cairo office as a target server.。 Create a stub zone named publishing.testking.com. Specify the DNS server in the Cairo office as a master server.。
（）是指私营部门的合作伙伴被授权在特定的时间内融资、设计、建造和运营基础设施组件（和向用户收费），在期满后，转交给公共部门的合作伙伴。
