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【单选题】
在PLD中如下所示，其逻辑表达式为（）A.
F=A+B+C
B.
F=A+C
C.
F=A·C
D.
F=A·B·C·D
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A.
yes
B.
no
C.
not sure
D.
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A.
clotting proteins
B.
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C.
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D.
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