13.(4.0分)大小相等、方向与作用线均相同的4个力F1、F22、F3、F4对同一点O之矩分别用-|||-M0(F1)、M0(F2 )、M0(F3)、M0(F44)表示。则-|||-F4-|||-D-|||-F-|||-C-|||-F2-|||-B-|||-F-|||-A-|||-A _(0)((F)_(1))+(M)_(0)((F)_(2))gt (M)_(0)((F)_(3))+Mo((F)_(4))-|||-B _(0)((F)_(1))lt (M)_(0)((F)_(2))lt (M)_(0)((F)_(3))lt Mo((F)_(4))-|||-C _(0)((F)_(1))=(M)_(0)((F)_(2))=(M)_(0)((F)_(3))=(M)_(0)((F)_(4))-|||-D _(0)((F)_(1))gt (M)_(0)((F)_(2))gt (M)_(0)((F)_(3))gt Mo((F)_(4))