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
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An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.
Explosive and flammable gasses are most likely to be encountered on a vessel（）.
An inflatable liferaft is floating in its container，attached to the ship by its painter，as the ship is sinking rapidly. Which action should be taken with respect to the liferaft container? （）
An all-round flashing yellow light may be exhibited by a(n)（）.
An azimuth angle for a body is measured from the（）.
All of the following vessels are “restricted in their ability to maneuver” EXCEPT a vessel （）.
An advantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it（）.
Air circulation is caused or affected by（）.
In handling break bulk hazardous materials，it is forbidden to use（）.
An example of an anchor which has a stock is a（）.