A. After referring a lot of sources over the internet and also during the assembly process of the telescope, it is advised to maintain an offset of ≥ 20mm from the size of primary mirror i.e., for a 6" or 150mm primary mirror size, 150 + (2*20) = 190mm should be the minimum inner diameter of your PVC tube.
You’ll find familiar controls on the Sonos Play, which comes in black or white. (Fingers crossed for future color options like the lovely trio that Sonos offers on the Roam.) On the top surface are buttons for play/pause, volume up and down and a microphone toggle. On the back is a power button, a Bluetooth button and a physical switch that disconnects the microphone for increased security. Finally, there’s a new feature here: a removable plastic grab loop.
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Байден похвастался своей забывчивостьюБайден похвастался, что забыл о Путине больше, чем другие узнают，详情可参考PDF资料
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Фото: Глеб Щелкунов / Коммерсантъ