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【简答题】
无机胶凝材料按硬化条件分 ( )和 ( ) 胶凝材料。
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举一反三
【单选题】You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.[ServiceContract（ ）]public interface IPaymentService{ [OperationContract（ ）] void Recor...
A.
Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(GetType(Person))]
B.
Implement the IExtensibleDataObject interface in the Person class.
C.
Implement the IExtension(ofType(T)) interface in the Person class.
D.
Add the following KnownType attributes to the Person class. [KnownType(GetType(Employee))] [KnownType(GetType(Customer))]