【单选题】50 / 492花岗岩密度约为?A2.63∼2.75 g/cm32.63\sim2.75\,\text{g/cm}^32.63∼2.75g/cm3正确B1.5∼1.8 g/cm31.5\sim1.8\,\text{g/cm}^31.5∼1.8g/cm3C3.5∼4.0 g/cm33.5\sim4.0\,\text{g/cm}^33.5∼4.0g/cm3D0.5∼0.8 g/cm30.5\sim0.8\,\text{g/cm}^30.5∼0.8g/cm3参考答案A参考解析2.63∼2.75 g/cm32.63\sim2.75\,\text{g/cm}^32.63∼2.75g/cm3。