房地产行业从业人员2002 - 2008年间各年的人均年收入是一个( )。
A．时期数列
B．相对数时间数列
C．平均数时间数列
D．时点数列
参考答案：C
Just as there are occupations that require college degrees also there are occupations for which technical training is necessary.
A．so to there are
B．so too there are
C．so there are
D．so too are there
场录井过程中，地层破裂压力分析方法主要选择（）法。
A、伊顿
B、艾克斯劳格
C、黄荣樽
D、DAINES
