成矿物质的运移形式存在的运移假说：
哪种原因导致如下错误消息的产生（） ["其他交换机使用错误的电缆连接到该交换机端口。","未经授权的用户试图通过交换机端口 Fa0\/8 telnet 到交换机。","路由器上启用了 NAT，同时有一个私有 IP 地址到达了交换机端口 Fa0\/8。","一台带有无效 IP 地址的主机连接到先前未曾使用的交换机端口。","交换机端口启用了端口安全性后，端口 Fa0\/8 上出现了未经授权的连接"]
用小体积管检定流量计，通常要求和大标准体积管同样的（）法 ["对接","联接","焊接","串接"]
The Cisco network-based virtual firewall service solution helps service providers to deliver cost-effective， scalable， integrated security services for enterprise customers using Cisco platforms.What is a virtual firewall？（） [" another name for a firewall deployed in routed mode"," another name for a firewall deployed in transparent mode"," a separation of multiple firewall security contexts on a single firewall"," a firewall that， when deployed in routed mode， can support up to 1000 VLANs per context"]
社会工作实践中的伦理难题（伦理困境）有哪些？
邮政法规定，邮政企业在乡镇人民政府所在地的服务时间是多少？
