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

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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

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The disinfection of various compartments in a vessel by filling with a gaseous agent to destroy rats and all insects pests which act as germ carriers means（）.

A.displacement
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Backing means the wind（）.

A.is changing clockwise in direction
B.is changing anticlockwise in direction
C.is changing cyclonically or variably in direction
D.remains unchanged in direction at the time

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

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