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【判断题】
票据一经签发并交付,即创设了一种请求权。 其发行的目的,主要在于证明已经存在的债权债务关系。A.
正确
B.
错误
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【单选题】如果 U ={ a , b , c , d , e } , A ={ a , c , d } , B ={ b , d , e } ,其中 U 是全集,那 C U A ∩ C U B =( )
A.
φ
B.
{ d }
C.
{ a , c }
D.
{ b , e }
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