一、填空题１．磁铁吸引铁、钴、镍等物质的性质，叫做磁性．具有的物质叫做磁体．２.使原来没有的物体获得的过程叫磁化．物体被磁化后，很容易消失的称为软磁体，能长期保持的称为硬磁体．电磁铁的磁心应该用来制造．３.周围存在着磁场．磁场的基本性质是对放入其中的磁体产? First, fill in the blank 1. Magnets attract the properties of iron, cobalt, nickel and other substances and are called magnetic. The substance is called a magnet. 2. The process that the original object does not have is called magnetization. After an object is magnetized, it is easily called a soft magnet that can easily disappear. It can be called a hard magnet for a long time. The core of the electromagnet should be used for manufacturing. 3. There is a magnetic field around. The basic properties of the magnetic field are produced by the magnets placed in them.