losconsoladores noe milk sicilia sexy portuguese ebony slut rough swinger fourway fucking


有一半径为R、电荷线密度为λ的均匀带电圆环,以角速度ω绕其一直径旋转。现将转动圆环置入匀强磁场中,磁感应强度B与转轴垂直,则圆环受到的磁力矩大小为(我知道答案是“1/2 * πλωBR3”请给我具体步骤)

Chinry 2小时前 悬赏5滴雨露 我来回答 举报
Copyright © 2021 photoscopeapp.com - 雨露学习互助 - 17 q. 0.194 s. - webmaster@yulucn.com
vrallure busty ebony beauty daizy cooper plays with her sex toys in virtual reality loan4k needing a loan makes the businesswoman hook up with a man certain men like to enjoy shaved pussies it gives them better visibility and juicier hole clea desires of submission full movie softcore with clea gaultier claire castel mariska kristof cale philippe soine daddy4k papa intelligent ne perd pas sa chance davoir des relations sexuelles avec ses fils nouvelle copine