题目

My friend named Paul received an expensive car from his brother as a Christmas present. On Christmas Eve when Paul came out of his office, a lovely boy was walking around the shining car. “Is this your car, sir?” he asked.Paul answered, “Yes, my brother gave it to me for Christmas.” The boy was surprised. “You mean your brother gave it to you and it did cost you nothing? Sir, I wish...” He hesitated(犹豫). Of course Paul knew what the boy wanted, but what the boy said surprised him greatly. “I wish,” the boy went on, “that I could be a brother like that.” Paul looked at t5．下列说法中正确的是（　　）A．根据狭义相对论物体运动质量和静止质量的关系m=$\frac{{m}_{0}}{\sqrt{1-\frac{{v}^{2}}{{c}^{2}}}}$，可以得出物体的速度可能达到光速B．考虑到各种综合因素，远距离输电，输电电压越高越好C．野外高压输电线在三条输电线的上方还有两条导线，它们与大地相连，形成一个稀疏的金属“网”，把高压线屏蔽起来，免遭雷击D．电容器外壳上标的是额定电压，也是该电容的击穿电压