But they sold high - grade resources to big investors and stopped prospecting , leaving low - grade gold ore unused 他们常常把高品位的资源卖给大投资商，却置低品位的金矿石而不顾，让它荒弃掉。
Low - grade petroleum reserves has a large proportion in the total petroleum resources in china 摘要低品位石油储量在中国石油资源总盆中占有很大的比重，通过对中国低品位石油储量的规模和特点。
It means that a lot of waste heat with low quality can be used to run a thermoacoustic prime mover 它意味着我们可以利用低品位热能，工业废热等来驱动热声发动机，热声热机可以得到更为广泛的应用。
It proves that dongsheng mode chiefly based on joint stock system is successful and good effect has been obtained 在此基础上，对我国低品位石油储量开发生产的政策法规进行了研究，主要包括审批和管理制度、企业运行机制、税收制度。
There are 4 , 134 tons of found gold reserves in china , ranking it no 8 in the world . however , more than 1 , 000 tons are low - grade and hard to smelt 中国探明的黄金储量有4134吨，在世界排名第八。然而其中1000多吨是低品位难选冶金矿。
Zhang ha - cheng , the feasibility of gas turbine generating unit inlet air cooling based on the lng chill recovery [ j ] . zhongguo dianli / electric power , 2002 , 35 ( 4 ) : 2426 王强,厉彦忠,陈曦.一种基于低品位热源的lng冷能回收低温动力系统j .热能动力工程, 2003 ( 3 ) ： 245247
Wang qiang , li ya - zhong , chen xi . a low temperature power cycle utilizing the cold energy of lng [ j ] . journal of engineering for thermal energy and power , 2003 ( 3 ) ： 245247 王强,厉彦忠,陈曦.一种基于低品位热源的lng冷能回收低温动力系统j .热能动力工程, 2003 ( 3 ) ： 245247
This paper describes the mn production and puts forward a new method to mine low - grade rhodochrosite using solving and soaking . the experimental results are presented in the paper 概述了锰矿的生产现状，提出了原地溶浸开采低品位菱锰矿新方法，给出了菱锰矿溶浸实验结果。
In a recent international mining forum in beijing , chen fumin , chairman of the china gold association , said the nation will encourage foreign companies to invest more in low - grade gold ore exploitation 最近在北京召开的国际矿业论坛会上，中国黄金协会主席成辅民说，中国鼓励外国公司多投资于低品位金矿的开发利用。
People think that , as a meeting of the behavior , if in the public in the implementation of occasions , it has similar animal instinct of the low level , low - grade the vulgar behavior with the public 人们认为，作为一种满足性需要的行为，若是在大庭广众的场合实施，它就有类同动物本能的低层次、低品位的庸俗行为之嫌。
