快车每小时行82千米，慢车每小时行69千米．6小时后，快车比慢车多行多少千米？

Fire protection regulations for towing vessels require all crew members to know how to perform each of these tasks EXCEPT（）.

A.start the mechanical ventilation system for the engine room

B.operate the fuel shut-off for the engine room

C.operate all fire extinguishing equipment aboard the vessel on board the vessel，including starting the fire pump

D.All of the above