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JZXC-480轨道电路室外防雷元件的检查测试及标准？

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教师自觉利用环境和自身的教育因素对学生进行熏陶和感染的方法是（）。

A. 榜样和示范
B. 陶冶
C. 修养
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You are managing a 24*7 database. The backup strategy for the database is to perform user-managed backups. Identify two prerequisites to perform the backups.（）

A. The database must be opened in restricted mode.
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C. The tablespaces are required to be in backup mode before taking the backup.
D. The tablespaces are required to be in read-only mode before taking the backu

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什么是营业税？哪些行业或行为需缴纳营业税？

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