primary frequency standard
短語詞組
- 5071A Primary Frequency Standard 銫原子鐘
- primary time and frequency standard 原級時頻標(biāo)準(zhǔn)
- primary cesium beam frequency standard 原級銫射束頻率標(biāo)準(zhǔn)
- frequency primary standard 頻率基準(zhǔn)
- time and frequency primary standard 時間頻率基準(zhǔn) 返回 primary frequency standard