June ____ (twelve) is his birthday.
(Ⅰ)若直线 AB 经过焦点 F ,且斜率为2,求 |AB| ;
(Ⅱ)当 OA⊥OB 时,求 |OA|⋅|OB| 的最小值.
“谁言寸草心,报得三春晖”。从权利和义务来看,体现了二者的一致性( )