在系统设计时应按（）。 ["按用户要求划分子系统","按领导要求划分子系统","按逻辑功能划分子系统","按管理机构划分子系统"]
数据推断
企业的流动负债包括短期借款、长期借款、应付账款、应付票据、应付股利、预收货款、应交税费、其他应付款等。
You are developing a data contract for a Windows Communication Foundation (WCF) service. The data in the data contract must participate in round trips. Strict schema validity is not required. You need to ensure that the contract is forward-compatible and allows new data members to be added to it. Which interface should you implement in the data contract class?（） ["ICommunicationObject","IExtension","IExtensibleObject","IExtensibleDataObject<\/t><\/t>"]
凡一定时期内每期都有收款或付款的现金流量，均属于年金问题。
简要说明什么叫面向连接？什么叫面向无连接？
