题目内容

对施放礼花弹的人员有哪些要求？

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施放礼花弹数量较多时，要考虑什么安全因素？

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维生素D的缺乏主要引起钙的吸收利用发生障碍。

A. 正确
B. 错误

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用卷扬往上吊料时，料到井口后，人员要远离井口，防止（）。

A. 坠入井下
B. 看不清
C. 木料坠下伤人

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You develop a Windows Communication Foundation (WCF) service that employees use to access bonus information.You define the following service contract. (Line numbers are included for reference only.) 01 [ServiceContract(SessionMode = SessionMode.Required)] 02 public interface IFinancialService 03 { 04 [OperationContract] 05 string Login(int employeeID, string passwordHash); 06 07 [OperationContract] 08 double GetBonus(int month); 09 10 [OperationContract(IsTerminating = true)] 11 void Logout(); 12 } Client application can invoke methods without logging in. You need to ensure that the client applications invoke Login before invoking any other method. You also need to ensure that client applications cannot consume the service after invoking Logout. Which two action should you perform? （）(Each correct answer presents part of the solution. Choose two.)。

A. Replace line 04 with the following code. [OperationContract(IsInitiating = false)]
B. Replace line 04 with the following code. [OperationContract(IsInitiating = true, IsTerminating = true)]
C. Replace line 07 with the following code. [OperationContract(IsInitiating = false)]
D. Replace line 10 with the following code. [OperationContract(IsInitiating = false, IsTerminating = true)]

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