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【单选题】
令R(x):x 是实数,Q(x):x 是有理数,所有有理数是实数.A.
∀x(Q(x) →R(x))
B.
∃x((Q(x) →R(x))
C.
∀x(R(x) →Q(x))
D.
∃x((R(x) →Q(x))
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举一反三
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