数据字典的建立在( )阶段进行。
A．系统规划
B．系统分析
C．系统设计
D．系统实施
参考答案：B
I had just stepped out of the bathroom and was busy drying myself with a towel ________ I heard
the steps.[ ]
A. while
B. when
C. since
D. after
法的第二级本质讲的是人们的行为自由和责任。
