平面玻璃 meaning in English

flat glass
plain glass

Flatness can be determined by covering a surface with an potically flat glass .
用一光学平面玻璃覆盖一个表面，可以测量平整度。
In practice, two semisilvered or aluminized glass optical flats form the reflecting boundary surface .
实际上，两块半镀银的或镀铝的光学平面玻璃构成了反射界面。
Standard specification for chemically strengthened flat glass
化学增强平面玻璃的标准规范
Shipbuilding - flat glass oil level gauges
造船.平面玻璃油位表
Standard specification for flat glass
平面玻璃标准规范

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