The geomagnetic field varies continuously .地磁场不断地发生变化。The geomagnetic field varies continuously.地磁场不断地发生变化.Electric compass is a sensor used to determine direction with the help of geomagnetic field.电子罗盘是一种利用地磁场来测量方位的传感器...
And some minutely crystalline varieties, such as flint, may be opaque and of a waxy luster.某些细小的结晶变种, 如燧石, 可能是不透明的,并具有腊样的光泽.The flatting mechanism of low luster paint of organic solvent was introduced.介绍了有机溶剂型哑光涂料的消光机理.T...