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low grade PbO -ZnO ore 氧化铅锌矿
A low number; a low grade of oil. 一个小的数; 低级油
John is down on his teacher because she gave him a low grade. 约翰恨他的导师，因为她给他打了低分。
My son mucked up the car engine by using cheap, low grade gasoline. 我的儿子使用便宜的低级汽油,汽车引擎损坏了。
It's a mid scale and its ore belongs to low grade structural altereds tyle, limonite, pyrite are mainly gold carriers. 矿石以低品位构造蚀变岩型为主,褐铁矿、铁矿是主要的载金矿物。
Low grades are getting Hellen down. 低分数使海伦闷闷不乐。
China's imports from India more Goa India from low grade iron ore, rather than high-grade iron ore. 中国从印度进口的更多的是产自印度Goa的品位较低的铁矿石，而不是高品位铁矿石。
He is a bit let down by the low grade he got. 这次成绩不好, 他有点气馁。
Low grades are get ting Helen down. 考分很低使海纶闷闷不乐。
The research is useful exploration for similar low grade ore pre-processing of demestic dilution type mine. 该研究对我国类似资源贫化型矿山低品位矿石的预选是一个有益的探索。
This thesis will discuss the extractable grade of low grade ore according the production state of Jintingling Mining CO,ltd. 就金亭岭矿业有限公司生产现状,对低品位矿石的可回收品位进行了探讨。
The ore structure of Daling Mine is complex in Jilin Nickel Industry Corporation, it is typical low grade difficulty mining deposit. 吉林镍业公司大岭矿矿岩结构复杂，为典型的低品位难采矿床。
The optimation of biooxidation pretreatment process of the flotation products of low grade hard to leach gold ore was made. 将低品位的难浸金矿先经浮选分离后,对不同浮选产品的细菌氧化预处理流程进行了优化。
My son muck up the car engine by using cheap, low grade gasoline. 我的儿子使用便宜的低级汽油,汽车引擎损坏了。
Si Dao Gou Gold Deposit occurred in medium low grade metamorphite system of Liaohe group,Sinian System.The ore deposit is controlled mainly by east west axial folded structure. 四道沟金矿床产于震旦系辽河群中低级变质岩系中，矿床主要受东西轴向的褶皱构造控制。
The teacher remonstrated with the boy about his low grades. 教师告诫男孩，说他的分数太低了。
The Bayan Obo cre depesit is a multi-metal associated ore deposit, which is celebrated for its low grade, fine,impure and refractory minerals in the world. 白云鄂博矿床是世界特有的铁、稀土、铌、钪等多金属共生矿床,以矿物的贫、细、杂、难选而闻名于世。
The teacher remonstrated with the boy about his low grade. 教师告诫男孩,说他的分数太低了。
My son muck up the car engine by using cheap,low grade gasoline. 我的儿子使用便宜的低级汽油，这把汽车引擎损坏了。
Based on analysis of techno-mineralogical properties of low grade hematite from Sijiaying Iron Ore Mine, test for determining the dressing ability of hematite has been done. 在对司家营贫赤铁矿工艺矿物学分析的基础上,根据矿石特点,进行了可选性试验研究。