why DoEs thE proFEssor tAkE FEDErAlExprEss AnDAirBornEExprEss As An ExAmplE in his lECturE
A、to DisplAy how Form utility is CrEAtED、
B、to illustrAtE how timE utility is CrEAtED、
C、to ExplAin how plACE utility is CrEAtED、
D、to show how ownErship utility is CrEAtED、