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【单选题】
设P11接按键key0，则在读取按键状态是，先要（）A.
P11=1;
B.
P11=10
C.
P11=0X00;
D.
P11=0XFF
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A.
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B.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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