单项选择题
Blocking open or removing fire dampers can cause（）.
A.fixed foam systems to be ineffective
B.faster cooling of the fire
C.the accumulation of explosive gases
D.the fire to spread through the ventilation system
点击查看答案&解析
相关考题
-
单项选择题
Before using a fixed CO2 system to fight an engine room fire，you must（）.
A.secure the engine room ventilation
B.secure the machinery in the engine room
C.evacuate all engine room personnel
D.All of the above -
单项选择题
Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.
A.immediately above the level of the oil
B.at the top of the tank
C.in the vent riser
D.one meter from the deck -
单项选择题
Backfire flame arrestors are installed on（）.
A.fuel tanks
B.spark plugs
C.carburetors
D.distributors
