Now you are going to hearthree short passages. Please listen to the third passage and Choose an approriate topic from the passage
A. self-control and caring
B. The virtue of self-control
C. some people need more help than children do
D. wisdom, the most important virtue
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下面变量中属于T-SQL中用户自定义的变量是( )
A. @@error
B. @number
C. Abc
D. num1
下面变量中属于T-SQL中全局变量是( )
A. @@ERROR
B. @number
C. Abc
D. num1
构成时间数列的两个基本要素是()
A. 主词和宾词
B. 变量和次数
C. 现象所属的时间及其统计指标数值
D. 时间和次数
某地区历年出生人口数是一个()
A. 时期数列
B. 时点数列
C. 分配数列
D. 平均指标时间数列