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问题 选择题

下列各题中，能用平方差公式的是[ ]

A．（a﹣2b）（a+2b）

B．（a﹣2b）（﹣a+2b）

C．（﹣a﹣2b）（﹣a﹣2b）

D．（﹣a﹣2b）（a+2b）

答案

答案：A

单项选择题

工程质量的验收均应在( )检查评定的基础上进行。

A．施工单位自行

B．监理单位

C．施工单位与监理单位联合

D．建设单位
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单项选择题

Consider the following statements: Statement 1: "When oligopoly firms cheat on price fixing agreements, the resulting price and output quantity approaches that of perfect competition. " Statement 2: "Monopolistic competition is inefficient because a large deadweight loss from advertising and marketing costs is a characteristic of this form of competition. " Which of the following best describes the accuracy of these statementsStatement 1Statement 2（）①A. IncorrectCorrect ②B. Correct Incorrect ③C. Correct Correct

A. ①

B. ②

C. ③
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