单项选择题 A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

单项选择题 A crew member is having an epileptic convulsion. You should（）.

单项选择题 A crew member has suffered frostbite to the toes of the right foot. Which is NOT an acceptable first aid measure?（）