圖所示正方形截面對(duì)要y1軸的慣性矩應(yīng)為:()
A.A B.B C.C D.D
如圖所示正方形截面對(duì)z1軸的慣性矩與對(duì)z軸慣性矩的關(guān)系是:()
如圖所示圓截面直徑為d,則截面對(duì)O點(diǎn)的極慣性矩為:()