单项选择题
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（）.
A.sound signal
B.light signal
C.visual signal
D.radiotelephone
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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 -
单项选择题
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 -
单项选择题
An example of an anchor which has a stock is a（）.
A.Bruce anchor
B.Dunn anchor
C.Hook anchor
D.Danforth anchor
