A.A flashing amber light
B.A fixed red light
C.A white flag raised and lowered vertically
D.A flashing white light
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A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
A.heavy
B.easily damaged
C.affected by temperature
D.costly relative to the strength ratio
A.stopper
B.screen
C.filter
D.restrictor
A.rising warm air
B.proximity to a low pressure area
C.inward spiraling circulation
D.clear dry weather
A.Has there been
B.Have there been
C.Has there
D.Have there
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All ships（）suspected infectious disease on board should radio information to Port Health Officer.
A heavy，thick-walled tube，usually steel，used between the drill pipe and the bit in the drill stem to weight the bit in order to improve its performance is called a（）.
A safe fuel system must（）.
A head-on situation at night is one in which you see dead ahead a vessel showing（）.
A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.
A helmsman receives the command “Right 15 degrees rudder.”The helmsman’s IMMEDIATE reply should be（）.
A large vessel is equipped with a controllable pitch propeller. Which statement is TRUE?（）
A large metallic device，mounted directly in the piping (usually located at the dock near the point where the vapor hose is attached)，designed to prevent the passage of a rapidly moving flame through the piping is called a（）.
An inert gas system on a tanker should be used to（）.
A fire pump may be used for other purposes if（）.