ic 2149造句
造句与例句
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- Spectra of thousands of stars to as faint as 13th magnitude were obtained, the first satellite UV spectrogram of a planetary nebula ( IC 2149 ) was obtained, revealing lines of aluminum and titanium-elements not previously observed in planetary nebulae, two photon emission from nebulae was detected for the first time.
- It's difficult to see ic 2149 in a sentence. 用ic 2149造句挺难的