Ag-O-Cs 银氧铯 ; 阴极
Ag-O-K 银
Ag-O-Csphotocathode 银氧铯光阴极
ag o 以前
nano-ag o 纳米ag
nano ag o 纳米ag
nano phase ag o 纳米氧化银
ag o cs cathode 银氧铯阴极
Ag-O-Cs photocathode 银氧铯光阴极
ADV You use ago when you are referring to past time. For example, if something happened one year ago, it is one year since it happened. If it happened a long time ago, it is a long time since it happened. 以前
He was killed a few days ago in a skiing accident.
他几天以前在一次滑雪事故中丧生。
The meeting is the first ever between the two sides since the war there began 14 years ago.
这是自从14年前双方爆发战争以来的第一次会晤。
This paper describes an effective improvement of the emissive properties of the Ag-O-Cs photocathode by repeating evaporation silver.
本文叙述了复蒸银对银氧铯阴极发射性质的改进。
This paper describes an effective improvement for the emissive properties of the Ag-O-Cs photocathode by repeated evaporation of silver.
叙述了复蒸银对银氧铯阴极发射性质的重大改进。
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