ƚ` R  .  `&  & MathType-@FdL  Times New Roman؟ww wf-2 `f2y2 ( 2y2 n" 1y2 ~2y2 n~4y2 2y2 i2ySymbolB ɠ؟ww wf-2 `F -y2 ` =y2 `y2 `>-y2 `=yTimes New Roman؟ww wf-2 `J xy2 `yy2 n"xy2 n~yy & "Systemf !-