贫矿

of poor quality in the quality of grind the faces of the poor mixture of ores and fluxes poor ignition quality fuel certificate of the system of quality certification determination of the quality of locality the new poor the poor in spirit poor means of transportation the State Bureau of Quality and Technical Supervision polarization of rich and poor poor quality quality of the fodder structure of ores poor quality beam poor quality concrete poor-quality concrete improve the quality of varieties quality of the natural water improve the quality of products examine the quality of seeds