单项选择题

Y形电路的三个电阻相等且为1Ω，变换为△形电路时，△形电路的三个电阻也相等且为 Ω。 A. 3 B. 9 C. 1/3 D. 6

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The spirit of harmony was embodied both in the past and today. In history, it was displayed in Wang Zhaojun’s marriage to Xiongnu Chanyu Huhanye which established friendly relations between the Han dynasty and Xiongnu.

答案：正确

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