Firstly, the research area is divided into three districts according to the physiognomy and the terrain: the northwest low mountainous area, north hilly area and northeast low mountainous area.
首先在空间上依据地形、地貌划分出三个区域:西北部低中山区、北部丘陵区和东北部低中山区。
Near the eastern horizon, the sky turned a pearly gray, but to the northwest, clouds hung low and threatening.
东方地平线上的天穹出现了灰白色,而西北方却乌云沉沉、步步进逼。
Heap leaching to low grade gold ore in the Northwest District has been proven a profit making method.
采用堆浸法处理低品位金矿石,在西北各主要产金省已取得了很好的经济效益。
应用推荐