HackerThe world depends on a collection of strange items. They're not cheap
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花生酱和一枚带有人造纹路的标准弹头看起来毫不相干。在这趟 NIST 探访中，两者承担同一项工作：给实验室一个已有测定结果、又尽量像待测对象的参照物。
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you would want to use the closest standard reference materialThey weren't fired through a gun, they were manufactured.