显现特征 meaning in Chinese

presentation attributes

Safe mining technique for coal face with large mining height and hard roof
坚硬顶板工作面矿山压力显现特征
Discussion on layout of top coal gateway for fully mechanized longwall top coal caving mining face
常村矿超长孤岛综放面矿压观测及显现特征
Mine pressure behavior of rery lons fully mechanized top coal caving working face of no . 21072 in changcun coal mine
常村矿21072超长孤岛综放面矿压显现特征