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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A fishing vessel casualty must be reported to the Coast Guard if it involves（）.
A jack-up drilling unit elevated on the Outer Continental Shelf must have a fog horn that will sound（）.
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（）.
A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.
Permanent magnetism is found in（）.
Entries should be made in a Ro-Ro vessel’s cargo-securing device record book for（）.
A fishing vessel displaying the lights shown is（）.
A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.