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History of the Incas by Pedro Sarmiento de Gamboa
Linear Algebra: Theorems and Applications
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检验基本知识培训
Posted on 2010-04-28
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1.感官检验的概念感官检验又称为官能检验，是指依靠人的感觉器官(眼、耳、口，鼻、舌等)对来自产品本身的各种有效刺激所作出的反应程度，来评价和判定产品质量的一种检验方法。 感官检验最早源于美国，具有直观性强，速度快，费用低等特点。感官检验是以人的感觉器官对某一对象刺激的反应值的大小来分辩产品的质量优劣。这个反应值是个“官能器”，一般分为两大类。一类是不受人的主观感觉的影响而客观存在的物质所固有的特性，如大小、颜色等。相对于这类官能量的检验，称为Ⅰ型感官检验，又叫分析型感官检验。现在已有各种仪器来代替这种感官检验。第二类感官量是由人的各自习惯和爱好决定的，对于这类质量特征的检验，称为Ⅱ型感官检验，亦称嗜好型感官检验，必须通过人的感觉来进行。如焊点是否光亮，元件是否歪斜等。应该说Ⅰ类和Ⅱ类感官检验的区分不是绝对的。2．感官质量的表示方法 (1)数值表示法 感官检验虽不如计量器具精确，但有时也可给出数量上的检验结果。如焊点上针孔缺陷，有时可用肉眼检验给出具体结果。(2)语言表示法 可用感官反应的术语如光滑、粗糙、歪斜、清晰等评价术语如“很”，“轻微”等组合起来进行描述。(3)图片或样品比较表示法与标准样品或极限样品比较，通过两者差异，作出质量评价。
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