航海英语消防用语单项选择题每日一练(2019.01.17)

单项选择题
The discharge side of every fire pump must be equipped with a（）.
A.gate valve
B.pressure gauge
C.check valve
D.strainer
单项选择题
On a ship，watertight doors should be operated（）.
A.during abandon drill
B.during fire drill
C.weekly
D.when the rig is being moved
单项选择题
One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.
A.it can break down under high heat and emit noxious fumes
B.it will decompose under prolonged storage and lose its effectiveness
C.fire has been known to flash back over the surface of an oil fire
D.it is ineffective in fighting fires in high-voltage electrical equipment
单项选择题
The blocking or absence of fire dampers can cause（）.
A.the accumulation of explosive gases
B.faster cooling of the fire
C.the fire to spread through the ventilation system
D.fixed foam systems to be ineffective
单项选择题
After using a Halon extinguisher，it should be（）.
A.put back in service if more than 50% of the charge remains
B.repainted
C.discarded
D.recharged