单项选择题
Which characteristic is an advantage of Halon as a fire extinguishing medium?（）
A.Electrically non-conductive B.Relatively inexpensive C.Effective against chemicals containing an oxidizer D.All of the above
单项选择题 Which action is routinely performed at the annual servicing and inspection of a dry-chemical cartridge-operated portable fire extinguisher?（）
单项选择题 Where would you find the FCC authorization for transmitting on your ship’s EPIRB?（）
单项选择题 Where should life jackets be stowed?（）.
