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严格坚持民主集中制，凡属方向性、全局性的问题和干部任免、大宗物资采购、重大经费开支、大项工程建设等重要决策，必须经（）决定。

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You discover that the schema changes that were recently made to your SQL Server 2005 database have caused your Web site to stop functioning. It is unclear who made the changes. TestKing.com now mandates that all changes to the database schema be tracked. You need to implement a mechanism that will track schema changes in your database. What should you do？（）

A. Implement a stored procedure that writes data about schema changes to a log table.
B. Implement DDL AFTER triggers that write user and schema information to a log table.
C. Implement a DML INSTEAD OF trigger that writes data about schema changes to a log table.
D. Implement a DML AFTER trigger that writes data about schema changes to a log table.

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实体形态的技术要素

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气体燃料的主要成分是（）。

A. CC0₂及H₂
B. CH₂及CH₄
C. H₂、CH₄及N₂
D. CN₂及O₂

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梁截面中性轴上各点的正应力大小为（）

A. 最大
B. 最小
C. 等于零
D. 无法确定

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