（）是证券市场上数量最多、最为活跃的经纪人。 佣金经纪人。 居间经纪人。 专家经纪人。 证券自营商。
下列（）不符合人机功能合理分配的原则。 笨重的、快速的、持久的由机器来做。 快速的、持久的、可靠性高的由人来做。 单调的、高阶运算的、操作复杂的由来机器做。 研究、创造、决策由人来做。
You have very few cisco 7920 wireless ip phones on your network， but lots of wireless laptops. You want to increase the bandwidth available for the laptops by decreasing the bandwidth reserved for the cisco 7920 phones. What is the lowest percentage of voice-allocated bandwidth you can select on the wlan controller？（） 55 percent。 75 percent。 40 percent。 25 percent。
You are unable to connect your computer to a wireless network projector. The wireless network projector does not appear in the list of available network projectors provided by the Connect to a Network Projector wizard. You need to connect to the network projector. What are two possible ways to achieve this goal？（） Start the Microsoft Windows Media Center Service Launcher service.。 Enable the File and Printer Sharing Windows Firewall exception.。 Connect your computer to the same subnet as the network projector.。 Type the IP address of the network projector in the Connect to a Network Projector wizard.。
线路发生接地短路时，对变电所母线来说，零序功率由（）流向（）。
如果协方差的数值小于零，则两种证券的收益率变动结果（）
