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餐饮企业如何选择适合自身的原料供应商？

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You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy. What should you do?（）

A. Decorate the service implementation class with the following line of code [ServiceBehavior(UseSyncronizationContext = false)]
B. Decorate the service implementation class with the following line of code [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
Call the Invoke method of the form and supply a delegate.
D. Call the BeginInvoke method of the form and supply a delegate.

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餐饮企业如何选择适合自身的原料供应商？

You are developing a Windows Communication Foundation (WCF) service that is hosted by a Windows Forms Application.The ServiceHost instance is created in the Form Constructor.You need to ensure that the service is not blocked while the UI thread is busy. What should you do?（）

分批培养中，延滞期的特点是什么？如何缩短延滞期？

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KLC29型空调机组压缩机过流继电器电器保护值设定为（）。