单项选择题

Who can contact the Designed Person?（）

A.the designated person
B.the captain
C.all senior officer
D.all officers and crew

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单项选择题

When shall the stand-on vessel change course and speed?（）

A.the stand-on vessel may change course and speed at any time as it has the right of way
B.after the give-way vessel sounds one blast in a crossing situation
C.when action by the give-way vessel alone cannot prevent collision
D.when the two vessels become less than half a mile apart

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

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