【正确答案】(1) The carrying vessel must really run up against the risks that threatens the safety of the ship and the cargoes.
   (2) The sacrifice of general average and the expenses paid must be reasonable.
   (3) The sacrifice of general average must be a willing and intentional action.
   (4) The sacrifice or expenses must be extraordinary in nature.
   (5) The purpose of the sacrifice and expenses is to save the ship, cargo and freight.