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.
Американская ракета дала сбой и рухнула в жилом районе02:31
The U.S. is on the brink of a “silver tsunami” as Baby Boomer small-business owners retire. The shift threatens millions of jobs, but also creates an opening for the next generation of entrepreneurs.。新收录的资料对此有专业解读
那段时间，我几乎失去了阅读与写作的兴趣，而神话的复杂与张力重新点燃了我对文字的好奇（或许单纯只是被弗莱叔华丽而睿智的写作风格折服😆）。后来又读到几篇颇有共鸣的感悟，索性提笔与 Gemini 一起写下这篇文章。恰逢少数派征文开启，发现主题与赛道设置竟与我想探讨的话题不谋而合，也算是一种难得的巧合。。新收录的资料是该领域的重要参考
tool is not a guarantee of better ranking
Global news & analysis，详情可参考新收录的资料