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.
As artificial-intelligence systems take on more of the scientific workflow, the central goal should not be complete automation, but designing platforms that preserve creativity, responsibility and surprise.。新收录的资料是该领域的重要参考
，更多细节参见新收录的资料
Bibliographic and Citation Tools。关于这个话题，新收录的资料提供了深入分析
第四十九条 承运人应当妥善、谨慎地接收、装载、搬移、积载、运输、保管、照料、卸载和交付所运货物。