Logistical operations can be divided into （）.
ABC
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Indesigningalogisticalsystem,adelicatebalancemustbemaintainedbetweentransportationcostand（）
Accordingtoacertaintypeofrate,ashippercannotbechargedlessthantheappropriaterateof4kginmostcases,eventhoughhisparticularconsignmentmayweighlessthanthis,wecallthistypeofrate（）.
Simplifiedwordsarecommonlyusedintelexmessagesbecausethechargeforatelexisbasedon（）.
Themarinecargoinsurancepremiumratesmayvarydependingonfactorssuchas____.