题目内容

以下关于数码管刷新率的说法正确的是()。

A. 人眼识别频率一般为24H左右,也就是说快于这个频率人眼就能识别出来
B. 人眼识别频率般为24H左右,也就是说慢于这个频率人眼就能识别出来
C. 假设人眼识别频率为25H,那么只要数码管刷新周期大于40ms就可以达到稳定显示的效果
D. 假设人眼识别频率为25H,那么只要数码管刷新周期小于40ms就可以达到稳定显示的效果

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数码管的动态显示需要有()信号和()信号。

要使开发板上的第一个数码管选中,74HC138的A2A1A0的取值分别为()。

Choose the right expressions about "American Dream"

A. The American Dreammeans different things to different people.
B. for many, particularly immigrants,it means the opportunity to make a better life for themselves.
C. For ordinary people, it means a happy family, an ideal job, and a nice house.
D. For minorities and immigrants, it also includes freedom and equal rights.

Choose the right expressions aboutthe"China Dream".

A. To realize the great renewal of the Chinese nation is the greatest dream for the Chinese nation in modern history.
B. The China Dream has conglomerated the long-cherished aspiration of Chinese people of several generations
C. The China Dreamrepresents the overall interests of the Chinese nation and Chinese people
D. The China Dreamhas been a common expectation of every Chinese

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