用线段的升降表达事物的动态(差值)变化的统计图为
A．条图
B．直方图
C．线图
D．半对数线图
E．百分条图
参考答案：C
It was yesterday ____ I saw her and it was almost 10 o’clock ____ she arrived.
A．when; when
B．that; that
C．when; that
D．that; when
（）不属于EDI系统构成要素。
A.通信网络
B.EDI硬件
C.数据标准化
D.GPS定位仪
