下列软件中，_____是数据库管理系统。
A．Visual BASIC 6.0
B．Oracle
C．Excel
D．Word
参考答案：B
(2013·河北高三教学质量检测)Many people tried to leave the country, ________ there was much violence and a serious shortage of food supply.
A．where
B．which
C．that
D．what
产业资本循环的第一阶段是______。
A．生产阶段 B．购买阶段C．销售阶段 D．流通阶段
