A:核反应方程为 A1327l + H11 → S1428i
B:核反应方程为 A1427l + H11 → S1427i + n01
C:硅原子核速度的数量级为107m/s
D:硅原子核速度的数量级为105m/s
We live on the Earth.The Earth was ____ ,but now some parts are dirty.Let's work together to keep the Earth pretty and healthy because the Earth is only home for all the living things.We should ____.We should ____.We also need water and trees.So we shouldn't ____.We should stop ____.
某自然保护区是我省最重要的湿地生态系统.保护区内植物资源丰富,不仅是鱼、虾、贝类的栖息地,更是鸟类的天堂.每年都有成千上万的越冬候鸟飞临此地栖息,其中包括白腰杓鹬、红腹滨鹬、红嘴鸥、金腰燕、白鹡鸰等118种珍稀物种.
河姆渡居民与半坡居民,在粮食培育、牲畜饲养的品种方面以及住房建筑结构方面存在着许多差异,造成这种差异的最主要因素是 ( )