You are creating a stored procedure that will delete data from the Contact table in a SQL Server 2005 database. The stored procedure includes the following Transact-SQL statement to handle any errors that occur. BEGIN TRY BEGIN TRANSACTION DELETE FROM Person.Contact WHERE ContactID = @ContactID COMMIT TRANSACTION END TRY BEGIN CATCH DECLARE @ErrorMessage nvarchar（2000） DECLARE @ErrorSeverity int DECLARE @ErrorState int SELECT @ErrorMessage = ERROR MESSAGE（），@ErrorSeverity=ERROR SEVERITY（），@ErrorState = ERROR STATE（） RAISERROR （@ErrorMessage， @ErrorSeverity， @ErrorState） END CATCH； You test the stored procedure and discover that it leaves open transactions. You need to modify the stored procedure so that it properly handles the open transactions. What should you do？（） Add a COMMIT TRANSACTION command to the CATCH block.。 Remove the COMMIT TRANSACTION command from the TRY block.。 Add a ROLLBACK TRANSACTION command to the CATCH block.。 Add a ROLLBACK TRANSACTION command to the TRY block.。
药物的首关效应可能发生于（） 舌下给药后。 吸人给药后。 口服给药后。 静脉注射后。 皮下给药后。
You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You derive a new validation control from the BaseValidator class. The validation logic for the control is implemented in the Validate method in the following manner. protected static bool Validate(string value) { ... } You need to override the method that validates the value of the related control. Which override method should you use?（）
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什么是统计分布？
简述I型内含子和II型内含子的结构特点。
挠度弧的画法有二种，分别是（）。
