A Windows Communication Foundation (WCF) service is generating a separate namespace declaration for each body member of a message contract,even though all body members share the same namespace. You need to simplify the XML representation of your message contract so that the namespace is only declared once. What should you do?（） [" Declare a wrapper namespace for the message contract by using the WrapperNamespace property of the MessageContract attribute"," Explicitly set the Namespace property of all the MessageBodyMember attrbutes to the same namespace."," Declare all of the body members as properties of a DataContract class and use the class as the only body member of the message contract."," Declare all of the body members as properties of a separate MessageContract class and use the class as the only body member of the message contract."]
外生成矿按其性质可分为物理分化作用
Web服务器和浏览器进行交互时，通过（）端口请求建立TCP连接。 ["80","16","15","127"]
构成企业存货资金的项目有（）。 ["储备资金","生产资金","成品资金","货币资金","结算资金"]
信息系统的网络拓扑结构有总线型、环型、关系型
按照法律规定，对生产经营单位的哪些人员需进行安全生产教育、培训？
