设有员工实体Employee （employeeID， name， sex，birth, age， tel， departID），其中employeeID为员工号，name为员工姓名，sex为员工性别，age为员工年龄，tel为员工电话，记录该员工的手机号码、办公室电话等，deparID为员工所在部门号，参照另一部门实体Department的主码deparID。Employee实体中存在派生属性（）。Employee实体中还存在多值属性（）。对属性departID的约束是（）。
关于无线微波扩频技术，以下哪种说法是错误的？（）。
包过滤防火墙对数据包的过滤依据不包括（）。
在以下几种网络交换技术中，适用于计算机网络、数据传输可靠、线路利用率较高且经济成本较低的是（）。
With hundreds of millions of electronic（）taking place daily， businesses and organizations have a strong incentive to protect the（）of the data exchanged in this manner， and to positively ensure the（）of those involved in the transactions. This has led to an industry-wide quest for better， more secure methods for controlling IT operations， and for deploying strong security mechanisms deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security（）that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in（）and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.
某市政府门户网站建立民意征集栏目，通过市长信箱、投诉举报、在线访谈、草案意见征集、热点调查、政风行风热线等多个子栏目，针对政策、法规、活动等事宜开展民意征集，接收群众的咨询、意见建议和举报投诉，并由相关政府部门就相关问题进行答复，此项功能主要体现电子政务（）服务的特性。