ISO 22531 2020 Optics and photonics — Optical materials and components — Test method for climate resistance of optical glass
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ISO 20485 2017 Non-destructive testing Leak testing Tracer gas method.pdf
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GB-T 22663-2008 工业机械电气设备 电磁兼容 机床抗扰度要求.pdf
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GB-T 17847-1999 小艇 电动风机.pdf