19.
Inchoosingatransportationmodeforaparticularproduct,shippersconsiderasmanyassixcriteria:speed,frequency,dependability,capability,availabilityandcost.Thusifashipperseeksspeed,airandtruckaretheprimecontenders.Ifthegoalislowcost,thenwaterandpipelinearetheprimecontenders.[8分]