By analyzing comparatively the relationship between the change of annual average temperature, rainfall, amount of livestock, scale of digging gold, scale of digging Chongcao and degeneration of the grassland ecosystem in Sanjiangyuan District, this paper offered more detailed proof for the theory on the degeneration induced b.
通过比较分析有测量记录的气温、降雨和年末牲畜存栏数、采金、挖虫草(Cordycepssinensis)规模的变化及其与草原植被覆盖度变化的关系,文章为人为成因说提供了更为翔实可靠的证据。
Lawless gold digging activities have caused serious geological problems in Gaize County,Ali Region of Tibet.
非法采金引起公路发生沉陷、塌方及滑坡等病害,严重地影响了公路交通和环境安全。
Discussion on application of silicon controlled rectifier in gold dredge;
浅谈可控硅在采金船上的应用
The checking computation of structural size of gold dredge in mining of gold placer;
砂金矿采金船开采结构尺寸验算
Ways of raising recovery rate of oredressing by gold dredge;
提高采金船选矿回收率的途径
Analysis of low reachability of gold dredger's design capacity;
采金船达产率低的原因分析
The current technological situation of combined mining with bulldozer and gold dredger and approaches to its perfection;
推土机-采金船联合开采的工艺现状及其完善途径