primary frequency standard
短語(yǔ)詞組
- 5071A Primary Frequency Standard 銫原子鍾
- primary time and frequency standard 原級(jí)時(shí)頻標(biāo)準(zhǔn)
- primary cesium beam frequency standard 原級(jí)銫射束頻率標(biāo)準(zhǔn)
- frequency primary standard 頻率基準(zhǔn)
- time and frequency primary standard 時(shí)間頻率基準(zhǔn) 返回 primary frequency standard