在Excel工作表的存储时，默认的扩展名是（）。 .DOC。 .XLS。 .WKS。 DBF。
《联合国国际货物销售合同公约》规定了几种风险移转的确立方式，主要包括（）。 交付时移转。 所有权转移时移转。 合同订立时移转。 买方接受时移转。
佣金经纪人不属于任何会员行号，而仅以个人名义在交易厅取得席位，是我们通常所说的自由经纪人，这类经纪人在美国最为流行。
The integrated services routing architecture provides the performance， availability， and reliabilityneeded to scale mission-critical business applications in the most demanding environments.Which statement best describes the benefits of Cisco Integrated Services Routers？（） ISRs provide threat defense against attacks from hackers and viruses that can occur in thenetwork.。 ISRs provide the framework to integrate and extend wired and wireless networks。 ISRs provide concurrent security， voice， data， wireless， and application optimization services.。 ISRS provide the common fabric， functionality， and CLI across the network.。
选相元件是综合重合闸装置的重要元件，其作用是当本线路发生（）时，正确选择（）。
The Cisco Smart Business Communications System offers support of third-party applications. When using TimeCard View， what device is used by employees to clock in and clock out？（）
