题目内容

P2.0端口接一独立按键，用手按下时为低电平状态。要在软件中判断该按键是否按下，则语句（）可以实现。

A. if(P2.0=0)
B. for(P2.0==0)
C. switch(P2.0==0)
D. while(P2_0==0)

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