单项选择题
A fire starts on you vessel while refueling. You should first（）.
A.stop the ventilation B.sound the general alarm C.determine the source of the fire D.attempt to extinguish the fire
单项选择题 A flame screen（）.
单项选择题 A foam-type portable fire extinguisher is most useful in fighting a fire in（）.
单项选择题 A foam-type portable fire extinguisher would be most useful in combating a fire in（）.
