单项选择题
Radiation spreads a fire by（）.
A.transferring heat across an unobstructed space B.heated gases flowing through ventilation systems C.burning liquids flowing into another space D.transmitting the heat of a fire through the ship's metal
单项选择题 Prior to getting underway，the Master or person in charge of a ship must（）.
单项选择题 Portable foam type fire extinguishers are most effective on（）.
单项选择题 Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.
