You design a Business Intelligence （BI） solution by using SQL Server 2008. You create a SQL Server 2008 Integration Services （SSIS） package to perform an extract， transform， and load （ETL） process to load data to a DimCustomer dimension table that contains 1 million rows. Your data flow uses the following components： A SQL Destination data flow task to insert new customers An OLE DB Command transform that updates existing customers On average， 25 percent of existing customer records is updated each night. You need to reduce the amount of time required to update customer records. What should you do？（） [" Modify the UPDATE statement in the OLE DB Command transform to use the PAGLOCK table hint. "," Modify the UPDATE statement in the OLE DB Command transform to use the TABLOCK table hint. "," Stage the data in the data flow. Replace the OLE DB Command transform in the data flow with an Execute SQL task in the control flow."," Stage the data in the data flow. Replace the UPDATE statement in the OLE DB Command transform with a DELETE statement followed by an INSERT statement."]
法医尸体检验的目的是（） ["确定死因","鉴别暴力死或非暴力死","判断自杀、他杀或灾害事故","确定毒物性质及其含量","推断死亡时间"]
下列因素中，影响盈亏平衡点产量的因素是（）。 ["员工数量","所得税","设计生产能力","产品价格"]
分析计算复杂电路中某个分支的电流或功率时，常用（）。 ["基尔霍夫定律","叠加定理","戴维南定理","欧姆定律"]
对投资项目进行不确定性分析的主要目的中，不包括（）。 ["提高投资决策的科学性","增加项目的经济效益","减少不确定性因素对经济效果评价的影响","预测项目承担风险的能力"]
简述可行性研究的主要内容。
