技术经济指标变动对产品成本的影响主要表现在对（）指标的影响。 ["产品成本","产品总成本","产品单位成本","成本总成本和单位成本"]
为什么必须进行电压调整？
现金等价物应同时具备的条件是（）。 ["能够转换为已知金额的现金","期限短","无价值变动风险","流动性强","价值变动风险小"]
You create a Visual Studio 2010 solution that includes a WCF service project and an ASP.NET project. The service includes a method named GetPeople that takes no arguments and returns an array of Person objects. The ASP.NET application uses a proxy class to access the service. You use the Add Service Reference wizard to generate the class. After you create the proxy， you move the service endpoint to a different port. You need to configure the client to use the new service address. In addition， you must change the implementation so that calls to the client proxy will return a List instead of an array. Which two actions should you perform？（） ["In the context menu for the service reference in the ASP.NET project， select the Configure Service Reference commSystem.Collections.Generic.List","In the context menu for the service reference in the ASP.NET project， select the Update Service Reference comma","Change the service interface and implementation to return a List
","Edit the address property of the endpoint element in the web.config file to use the new service address<\/person>"]
晶体三极管基极电流有一小的变化，将引起集电极电流较大的变化，所以晶体三极管具有（）放大作用，其放大倍数为△Ic/△Ib=β。 ["电压","电流","功率","能量"]
试述金圣叹对小说理论的贡献。
