A.Their bearing is almost constant，even when the true bearing of the contact changes appreciably
B.They always appear on a bearing of 90°From the true bearing of the contact
C.The indirect echoes usually appear in shadow sectors
D.When plotted，their movements are usually abnormal
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A.sound signal
B.light signal
C.visual signal
D.radiotelephone
A.icebreaker support is finished
B.icebreaker support is commencing
C.the icebreaker is icebound
D.the icebreaker is beset
A.I am altering my course to starboard
B.I am altering my course to port
C.I am operating astern propulsion
D.My vessel is stopped and making no way through the water
A.Bruce anchor
B.Dunn anchor
C.Hook anchor
D.Danforth anchor
A.naphtha，vm and p
B.tridecanol
C.cottonseed oil
D.camphor oil
最新試題
An icebreaker may use the code letter “K” to remind ships of their obligation to listen continuously on their radio. This signal may be made by any of the following EXCEPT（）.
An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.
An example of an anchor which has a stock is a（）.
An example of a grade B product is（）.
An engine compartment gasoline fire requires which type of extinguisher?（）
An “atoll cloud” forming over an island due to heating of the land during the daytime would be which type? （）
Air circulation is caused or affected by（）.
In handling break bulk hazardous materials，it is forbidden to use（）.
An aneroid barometer on a boat should always be（）.
An “on-load” release system on a survival craft means the cable can be released（）.