单项选择题
An icebreaker displaying a flag hoist which consists of the code letters “WO” (Whiskey Oscar) is indicating that（）.
A.icebreaker support is finished
B.icebreaker support is commencing
C.the icebreaker is icebound
D.the icebreaker is beset
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An icebreaker assisting a vessel through an ice field would display a visual signal consisting of the code letter “E” (Echo) to signify that “（）”.
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 -
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An example of an anchor which has a stock is a（）.
A.Bruce anchor
B.Dunn anchor
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A.naphtha，vm and p
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C.cottonseed oil
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