单项选择题
A.mechanical foam B.chemical foam C.carbon dioxide D.soda acid
If a CO2 fire extinguisher is not readily available, wh...
单项选择题If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）
A.Dry chemical B.Halon C.Low velocity fog D.Steam
You hear the general alarm bells and ships whistle soun...
单项选择题You hear the general alarm bells and ships whistle sound for over 10 secondsTraditionally, this is the signal for （）.
A.abandon ship B.dismissal from drills C.fire and emergency D.lower lifeboats
The abandon ship signal sounded by the vessels whistle ...
单项选择题The abandon ship signal sounded by the vessels whistle is （）.
A.6 short blasts and 1 long blast B.long blast mare than 6 short blasts C.more than 6 short blasts and 1 long blast D.1 long blast of at least 10 seconds
