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IC5说明书中确定Z-ratio时,有如下的一段 Laboratory results indicate that Z-values of materials in thin-film form are very close to the bulk values.However ,for high stress producing materials,Z-values of thin films are slightly smaller than those of the bulk materials. 请问bulk alue中的bulk是啥意思啊?还有high stress producing material是什么样的材料啊      |