【摘要】 对国家标准GB 475—2008《商品煤样人工采取方法》和GB 474—1996《煤样的制备方法》规定的采样精密度核验方法和制样精密度核验方法进行了研究,举例阐述了对采制样精密度核验方法的见解和观点。核验制样和化验精密度时,双份试样的制备可将一份试样按照例常制样程序制备出试验试样,然后收集全部弃样再按照例常制样程序制备出试验试样,两个样品组成一对双份试样。更多还原

【Abstract】 The methods of testing precision of manual sampling and preparation provided by national standard GB 475-2008(Method for manual sampling of commercial coal) and GB 474-2008(Method for preparation of coal sample) were studied,and same opinions and suggestions were presented.In the process of testing precision of manual sampling and preparation,one sample was prepared according to general preparation process,another sample was prepared by collecting all abandoning coal sample in general preparation process.then,a pair of samples were composed with these two samples.更多还原