a primary standard facility of diffuse visual transmission density
Standard platinum resistance thermometer Grade Ⅱ
standard platinum resistance thermometer
Standard Platinum Resistance
Standard Platinum Electric Resistance Thermometer
Second Grade Standard Platinum Resistance Thermometer
universal primary standard substance
primary standard substance
primary standard pyrheliometer
primary standard of color
primary standard material purity
primary standard barometer
primary standard
基标准
原型标准
原始标准
标淮原器
原量器
原标准
基本标准
基准
基准物质
一级标准
原级标准
photometric primary standard
National primary standard
metrology primary standard