Ritchey–Chrétien telescope
No Pronunciation Data
Chinese definitions:
里奇-克莱琴望远镜 [lǐ qí kè lái qín wàng yuǎn jìng]
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.