standard substance
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美
- 标准物质
双语例句
- The two gaseous Reference Materials, Carbon dioxide in nitrogen and methane in air, belong to standard mixed gases.
氮中二氧化碳和空气中甲烷气体标准物质属于标准混合气。 - Their pureness deterimined in methods of two different priciples and conformed to the technical norm of first grade military standard substance.
四种标准物质采用两种不同方法定值，结果均达到一级军用标准物质要求。
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