多项选择题

下列关于通货膨胀的叙述正确的是()。

A: 几种商品物价上升就是通货膨胀
B: 通货膨胀必须是持续一定时期的物价上升
C: 通货膨胀是物价水平的普遍上升
D: 通货膨胀率是指现期某些物品的价值与基期同样物品价值的比率
E: 物价指数是现期物价指数较前期变动的百分比

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判断题

计算控件的控件源是计算表达式。正确错误

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