（）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
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
提高反应器的反应速率的最有效方法是（）
A. 提高反应器压力
B. 提高反应器投料量和采出量
C. 提高反应器投料量
D. 提高反应器温度
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