A.at all times
B.in the bottom return mode
C.in the volume reverberation mode
D.only when there is no current
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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
A.From
B.By
C.on
D.With
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All ships（）suspected infectious disease on board should radio information to Port Health Officer.
A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.
Permanent magnetism is found in（）.
It is not necessary to declare（）in the Health List.
A head-on situation at night is one in which you see dead ahead a vessel showing（）.
A fire is discovered in the bow of your vessel while making way. The wind is from ahead at 35 knots. You should（）.
An inert gas system on a tanker should be used to（）.
A fixed carbon dioxide extinguishing system for a machinery space，designed WITHOUT a stop valve in the line leading to the protected space，is actuated by（）.
A fishing vessel casualty must be reported to the Coast Guard if it involves（）.
Between 1830 hrs and 1850 hrs this day，strong gusty winds（）by my vessel，in consequence of which the vessel’s four mooring lines were broken.