NIST-SRM 912b Urea
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This Standard Reference Material (SRM) is intended primarily for calibrating apparatus and validating methods used in clinical and pathology laboratories. It is certified as a chemical of known purity. A unit of SRM 912a consists of 25 g of high purity urea contained in a glass bottle.
本标准参考物质（SRM）主要用于校准临床和病理学实验室中使用的仪器和验证方法。它被证明是一种已知纯度的化学品。SRM 912a的一个单元由25克装在玻璃瓶中的高纯度尿素组成。 NIST-SRM 912b
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SRM 912 Urea, September 24, 1968
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