De-Exemption 解除豁免
de minimis exemption 低额豁免
exemption de peine 免刑
De-ratting or De-ratting Exemption Certificate 除鼠或免予除鼠证书
·2,447,543篇论文数据，部分数据来源于NoteExpress
There is no de minimis exemption for these metals if they are necessary for the functionality or production of the product, so even trace amounts count.
FORBES: Conflict Minerals Rule Imposes Big Burdens On Manufacturers
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