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屋面卷材防水施工时，泛水处卷材应向垂直面上翻，其高度不宜小于（）。

A. 200
B. 250
C. 300
D. 350

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对于不同小区定向天线间水平20mm已经满足隔离要求，而且与天线3dB宽无关。

A. 正确
B. 错误

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A corrupted file system is now repaired and back in use. Some， but not all of the files within the file systems have been deleted. The only backup of this file system is a month-old tar archive. This archive will need to be restored as root. Which two statements correctly describe the effects of the restore operation？（）

A. Files found in the file system that are also on tape will NOT be overwritten.
B. The missing files， present on the backup tape， are restored to the file system with the data as it was when the backup was taken.
C. The access times are preserved by tar and will reflect the time when a user last accessed the data.
D. The modification time on the files restored by tar will be preserved and will reflect the time the file was last modified before the backup， NOT the time of the restore operation.

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简述国际货币体系。

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开发研究，又称发展研究，是指运用基础研究和应用研究的成果，为解决教育改革和发展重的问题而创造性地提出或制订可操作的方案、计划、对策及建议等。（）

A. 正确
B. 错误

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屋面卷材防水施工时，泛水处卷材应向垂直面上翻，其高度不宜小于（）。

A. 200 B. 250 C. 300 D. 350

对于不同小区定向天线间水平20mm已经满足隔离要求，而且与天线3dB宽无关。

简述国际货币体系。

开发研究，又称发展研究，是指运用基础研究和应用研究的成果，为解决教育改革和发展重的问题而创造性地提出或制订可操作的方案、计划、对策及建议等。（）

A. 200
B. 250
C. 300
D. 350