单项选择题

If a currency is allowed to move freely until it violates economic fundamentals, that currency is said to have

A.a free floating system.
B.a currency board.
C.a stable basket.
D.a managed float.
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问答题

在单片机P0.0口接一个LED,试着写一个闪烁程序。要求亮的时间大于灭的时间。

答案: #include"reg51.h" 
 sbit P0_0=P0^0;   
void delay(...
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