单项选择题
A.harder it is to extinguish
B.easier it is to extinguish
C.less chance there is of re-ignition
D.easier it is to control
单项选择题 During oil transfer operations, who would be responsible to guarantee that the posted transfer procedures are being followed?（）
单项选择题 In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.
单项选择题 When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.