A. 同一时间点上现金流入和现金流出之和，称为净现金流量
B. 现金流量图表示现金流入、现金流出及其与时间的对应关系
C. 现金流量图的零点表示时间序列的起点，同时也是第一个现金流量的时间点
D. 垂直线的箭头表示现金流动的方向，箭头向上表示现金流出，即表示费用
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