单项选择题
By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）
A.24 months
B.36 months
C.42 months
D.54 months
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相关考题
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单项选择题
At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.
A.in distress
B.approaching a bend in the channel
C.operating astern propulsion
D.intending to overtake another vessel -
单项选择题
AS SOON AS I HAVE FURTHER INFORMATION I WILL MAKE ANOTHER ANNOUNCEMENT. I ASK YOU KINDLY TO REMAIN CALM. THERE IS NO DANGER AT THIS TIME. These words are likely from（）.
A.the captain of a vessel in distress
B.representative of ship owners
C.an officer from port authorities
D.the pilot of a vessel entering a port in foreign country -
单项选择题
An orange flag showing a black circle and square is a（）.
A.signal indicating a course change
B.distress signal
C.signal of asking to communicate with another vessel
D.signal indicating danger
