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【单选题】
为用户提供模板的数据库是（）。A.
master数据库
B.
msdb数据库
C.
tempdb数据库
D.
model数据库
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皮皮学刷刷变学霸
举一反三
【简答题】The variance is based on the between the value of each observation and the mean, the difference is called a about the mean. In the computation of the variance, the deviations about the mean are .
【单选题】The standard error of the mean
A.
is never larger than the standard deviation of the population.
B.
decreases as the sample size increases.
C.
measures the variability of the mean from sample to sample.
D.
All of the above.
【简答题】STP
【简答题】STP
【简答题】A．breakdown B．breakout C．breakaway D．breakin
【简答题】的作用是吸收紫外线的光能,并将其转换成热能或无害的可见光波释放出来。
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