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【单选题】
下列命题联结词集合中,是最小联结词组的是( )A.
{ ù ， }
B.
{ ù ，∨，∧ }
C.
{ ù ，∧ }
D.
{ ∧，→ }
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A.
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B.
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A.
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D.
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A.
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A.
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B.
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C.
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D.
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