GB/T 6730.7-2016(\u82f1\u6587\u7248)
铁矿石 金属铁含量的测定 磺基水杨酸分光光度法
UNE 64062:1978
MIXED FEEDS AND RAW MATERIALS. EVALUATION OF RAW PROTEIN SOLUBILIZED BY PEPSINE AND CLORHYDRIC ACID.