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我国“北斗”卫星导航系统是世界上第（）个成熟的导航卫星系统

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在学前儿童语言教育活动中，教师的适宜性提问一般包括哪些方式？

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（）工程是服装投入正式生产的第一道工程，直接影响产品质量的好坏。

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T425型精密坐标镗床工作台导轨与滑座上导轨之间用滚柱、保持架组成滚动导轨，其运动灵活轻快，微动进给时不会产生（）。

A. 冲击
B. 爬行
C. 撞击
D. 滞后
E. 振动
F. 抖动

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You executed the following command in Recovery Manager （RMAN） against your Oracle 10g database： RMAN> REPORT NEED BACKUP days 3; What would be the output of this command？（）

A. a list of files that require a backup within three days
B. a list of files that have not been backed up for three days
C. a list of files that RMAN recommends be backed up only once in every three days， based on low volatility
D. a list of files for which a backup has already been performed and may need a backup after three day

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