单项选择题

Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.

A.flashing point
B.combustion point
C.auto-ignition point
D.lower explosive limit

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单项选择题

Where shall the key to C02 room be kept?（）

A.In master's cabin
B.In third office's cabin
C.In a break-glass-type enclosure conspicuously located adjacent to the room
D.In a locked locker conspicuously located adjacent to the room

单项选择题

Your vessel is crossing a narrow channel.A vessel to port is within the channel and crossing your course.She is showing a black cylinder.What is your responsibility?（）

A.hold your course and speed
B.sound the danger signal
C.begin an exchange of passing signals
D.do not cross the channel if you might impede the other vessel