题目

Today many people say that women have the same chance as men in society. But this was not always so. In the past, women all over the world had to fight to get the same chance as men in education and jobs. Many people said that women should not receive much education because they would not do as well as men when they went to work.. One woman who showed that women should have the same chance was Marie, a scientist. In the 1800s scientists knew that a metal, uranium, gave off radiation. They also knew how much radiation came from his element. But they didn’t know what this radiation was like; t15．在“测定金属电阻率”的实验过程中（1）若合金丝长度为L，直径为D，阻值为R，则其电阻率ρ=$\frac{πR{D}^{2}}{4L}$．（2）用螺旋测微器测合金丝的直径如图所示，读数为1.881mm．