划分市场结构的标准包括
A.企业的产品种类
B.企业控制价格的能力
C.企业产品的标准化程度
D.企业聚合能力
E.企业进入市场的难易程度
正确答案是BCE
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Computers have many uses today. Computers can solve difficult problems and control complex machines. Many people use small computers called calculators to add,subtract,multiply,and divide numbers quickly. Scientists use large comput