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集油井在燃油系统中有何作用？

You are managing an Oracle Database 10g database that uses Oracle Managed Files （OMF）. You enabled the block change tracking feature for the database. Which statement regarding the change tracking file is true？（）

A. One block change tracking file is created for each data file. By default， the file is created in DB_CREATE_FILE_DES
B. One block change tracking file is created for each data file. By default， the file is created in BACKGROUND_DUMP_DES
C. One block change tracking file is created for the database. By default， the file is created in DB_CREATE_FILE_DES
D. One block change tracking file is created for the database. By default， the file is created in BACKGROUND_DUMP_DES

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“文化大革命”的导火线是（）

A. 城乡社会主义教育运动
B. 《评新编历史剧》的发表
C. “五一六通知”
D. 对电影《武训传》的批判

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常规标本采集时错误的做法是（）。

A. 将写有身高、体重的化验单标签贴在尿杯侧面，并核对
B. 向老人说明采集的目的和方法，以取得合作
C. 协助老人取半卧位，屈膝，腿微开
D. 将化验单和所留尿液一同送往化验室

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