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【单选题】
设A={1，2，3，4，5}，B={6，7，8，9，10}，以下哪个关系是从A到B的函数( )A.
f ={<1，7>，<2，6>，<3，5>，<1，9>，<5，10>}
B.
f ={<1，8>，<2，6>，<3，7>，<4，9>，<5，10>}
C.
f ={<1，7>，<2，6>，<3，5>，<4，6>}
D.
f ={<1，10>，<2，6>，<3，7>，<4，8>，<5，10>}
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