题目:
若D1=a1,a2,a3),D2=b1,b2,b3,则D1×D2集合中共有元组______个。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:The short-run supply curve for a firm is its MC curve above the AVC curve. Price takers will produce where price (P) equals MC. At prices below the AVC...