rpmを1秒あたりの回転数として計算して撃沈した人を馬鹿にするのはやめましょうね

Default Widget

This is Sidebar 1. You can edit the content that appears here by visiting your Widgets panel and modifying the current widgets in Sidebar 1. Or, if you want to be a true ninja, you can add your own content to this sidebar by using the appropriate hooks.