In order to meet the traceability of large attenuation, a new model PAS-1 attenuation measuring receiver and then a new national attenuation standard system are developed.
为了满足大衰减量值的溯源，研制成功了新的PAS 1型衰减测量接收机和新的国家标准装置。
In order to meet the traceability of large attenuation, a new model PAS-1 attenuation measuring receiver and then a new national attenuation standard system are developed.
为了满足大衰减量值的溯源，研制成功了新的PAS 1型衰减测量接收机和新的国家标准装置。
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