关于在小区种植鉴定中使用的标准样品，下列表述中最恰当的是（） 标准样品必须每年进行更新。 标准样品的管理包括接收、繁殖和流转。 判定检测样品时，品种描述比标准样品更可靠。 标准样品要尽可能代表品种原有的特征特性。
企业核心能力的概念及特征是什么？
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You define the following class. Public Class Product Public Property Price() As Decimal Get End Get Set(ByVal value As Decimal) End Set End Property End Class Your application contains a Web form with a Label control named lblPrice. You use a StringReader variable named xmlStream to access the following XML fragment. You need to display the price of the product from the XML fragment in the lblPrice Label control. Which code segment should you use? （） A。 B。 C。 D。
简述青年初期心理发展的特征。
You are planning the migration of a Microsoft SQL Server 2008 database to SQL Azure. You need to recommend an approach for ensuring that database connectivity does not degrade. Which two actions should you recommend？（） Implement transactions for database queries.。 Close database connections in the application.。 Use Microsoft ADO.NET in the data access layer.。 Implement a retry policy in the data access layer.。
现代科学的安全哲学观应是（）
