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工伤保险的主要特点是哪些?

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桥枕与护木的联结处,桥枕应刻20~30mm深槽口与护木相联。

A. 正确
B. 错误

下列不属于《中华人民共和国邮政法》第三十七条规定不得寄递物品的是()。

A. 国内互寄的户口簿
B. 散布谣言扰乱社会秩序,破坏社会稳定的
C. 煽动民族仇恨、民族歧视,破坏民族团结的
D. 宣扬邪教或者迷信的

You received complaints about the degradation of SQL query performance. You identified top SQL queries that consume time. What would be your next step to find out recommendations about statistics collection and restructuring of the SQL statement to improve query performance?()

A. run Segment Advisor
B. run SQL Tuning Advisor on top SQL statements
C. run the Automatic Workload Repository (AWR) report
D. run the Automatic Database Diagnostic Monitor (ADDM)on top SQL statement

DC600V供电的客车温水箱加热管采用()电源。

A. 110V
B. 220V
C. 380V
D. 600V

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