下列式子中, 不正确 的是
A.∃xA(x)→B⟺ ∀x(A(x)→B)
B.∃x(A(x)⋀B(x))⟺ ∃xA(x)⋀∃xB(x)
C.A→∀xB(x)⟺ ∀x(A→B(x))
D.∀x(A(x)⋀B(x))⟺ ∀xA(x)⋀∀xB(x)
正确答案是B
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