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【简答题】
如果两个集合A和B均为可列集,试证明A×B也是可列的.
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正确
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错误
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【单选题】She picked up Spanish when she was living in Mexico.
A.
to take hold of and lift or move
B.
to go somewhere in your car and collect sb. who is waiting for you
C.
to get information or a skill by chance rather than by making a deliberate effort
【单选题】We drove to the airport the next morning to pick up Susan.
A.
to take hold of and lift or move
B.
to go somewhere in your car and collect sb. who is waiting for you
C.
to get information or a skill by chance rather than by making a deliberate effort
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A.
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B.
胚珠
C.
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D.
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A.
服务特性
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文化特性
C.
价格
D.
品质
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A.
艺术欣赏是一种在创造的活动
B.
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C.
艺术欣赏是个人的活动
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A.
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B.
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C.
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D.
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A.
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B.
感觉与认识的对立
C.
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D.
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