题目

如图1-17,已知= =,则下列各式中正确的是(　　)图1-17A. =                          B.∠A =∠A′C. =                           D. = 答案：思路分析:在△AOB和△A′OB′中,∵= =,∠AOB =∠A′OB′,∴△AOB∽△A′OB′.∴∠A =∠A′.答案:B

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