【单选题】【消耗次数：1】
6.1.4长期中土地供给的价格弹性（ ）。
①
A 等于0
②
B 无穷大
③
C 小于1
④
D 等于1
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相关题目
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设 A={a,b,c,d}, A上的关系R1={a,aa,bb,d}，R2={a,db,cb,dc,b}，则合成关系R2○R1等于：
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{a,aa,ca,d
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【单选题】
设 A={a,b,c,d}, A上的关系R1={a,aa,bb,d}，R2={a,db,cb,dc,b}，则合成关系R1○R2等于：
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{a,aa,ca,d
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【简答题】
设 A={a,b,c,d}, A上的关系R1={,,}，R2={,,,}，则合成关系R1○R2等于：[填空1]
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设 A = {1, 22, 43, 3}，B = {1, 32, 44, 2}，则交关系A∩B等于：
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{1,23,3}.
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