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standard reference materials
nautic., tech. 标准基准材料
water.res., ecol. 标准参考物质
standard reference material
chem. 标准参考物质
el. 标准参照材料
geophys. 标准参考【照】物
space 标准参考材料
tech. 标准物质; 标准参照样
standard reference materials: 3 phrases in 2 subjects
Earth sciences2
United Nations1

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