【单选题】【消耗次数：1】
寡头垄断市场和完全垄断市场的主要区别是（）
①
企业数目不同
②
竞争策略不同
③
成本结构不同
④
从事开发和研究的力度不同
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完全垄断市场中如果A市场价格高于B市场价格，则（）。
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