题目内容

对总例数为N的k个处理组的完全随机设计方差分析,其组间的自由度为()

A. N-1
B. N-2
C. k-1
D. k-2
E. N-k

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进展期胃癌按Broomann法分为()、溃疡局限型、浸润溃疡型、弥散浸润型。

在改变给定值的控制系统中,被控量第一次达到稳态值所需时间tr是()。

A. 上升时间
B. 峰值时间
C. 过渡过程时间
D. 振荡周期

You have only two redo log groups and these groups get overwritten several times in a day. Your database operates in NOARCHIVELOG mode and user-managed consistent backups are performed every Sunday night. On Thursday morning, you find that an important table has been dropped and purged. With reference to this scenario, up to what point in time can the data be recovered?()

A. until Thursday morning
B. until that point in time when the database is opened
C. until that point in time when the recovery is performed
D. until last Sunday’s backup
E. until that point in time when the table is dropped and purged
F. until Wednesday evening

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