Pairs of such reflecting surfaces are known as etalons.
这样一对反射面通常称为标准具。
The company concentrates on design, production and distribution as the whole, which is a professional company for engaging producing all kinds of fasteners and non-etalons.
公司集设计、生产、销售为一体，是一家从事生产各类紧固件、非标准件的专业公司。
The company concentrates on design, production and distribution as the whole, which is a professional company for engaging producing all kinds of fasteners and non-etalons.
公司集设计、生产、销售为一体，是一家从事生产各类紧固件、非标准件的专业公司。
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