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难免流产

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什么叫合资铁路？

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排水工程平面图上画的管道（指单线）即是管道的中心线，室外排水管道的平面定位即是指到管道中心线的距离。

A. 正确
B. 错误

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A file on the system ahs been lost, but the latest version is on a mksysb tape. The file is extracted from this mksysb tape by loading the tape. Which of the following indicates where the tape will be skipped forward?（）

A. Third image, and resoting the file with the tar command
B. Third image, and restoring the file with the dd command
C. Fourth image, and restoring the file with the restore command
D. Fourth image followed by the tar command

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护患关系的特征有哪些？

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