Learn how this standard began, and read about the specifications that it covers.
了解这项标准如何开展，并阅读其中涵盖的各种规范。
The main specifications of the standard are compared with those of several foreign standards.
与国外同类标准物质的主要性能指标作了对比。
The main specifications of the standard are compared with those of several foreign standards.
与国外同类标准物质的主要性能指标作了对比。
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