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blood system of wool grading
anim.husb.
美国羊毛分级制
;
血统分级制
美国羊毛最初按含细毛羊血液多少分级,现在则与血统无关系。按该制度将羊毛分为细毛、半血毛、38血毛、1/4血毛、1/4血低级毛、普通毛及发辫毛7级
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