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单项选择题

A.MR=MCB.MR=SMC=LMCC.MR=SMC=LMC=SACD.MR=SMC=LMC=SAC=LAC……

完全垄断厂商实现长期均衡的条件是()

A.MR=MC
B.MR=SMC=LMC
C.MR=SMC=LMC=SAC
D.MR=SMC=LMC=SAC=LAC

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