题目内容

艏侧推要求原动机具有变速变向功能是指（）。

A. 调距桨
B. 定距桨
C. 喷水推进
D. Z型传动驱动螺旋桨

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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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艏侧推要求原动机具有变速变向功能是指（）。

A. 调距桨 B. 定距桨 C. 喷水推进 D. Z型传动驱动螺旋桨

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（）。

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。

A. 调距桨
B. 定距桨
C. 喷水推进
D. Z型传动驱动螺旋桨