航海英语遇险通信章节练习(2019.05.10)

单项选择题
When can routine communications be resumed when radio silence has been imposed?（）
A.After determining that the frequency or channel appears to be no longer in use
B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C.Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D.If，in the Master's opinion，communications on that frequency will interfere with emergency communications
单项选择题
You can indicate that your vessel is in distress by（）.
A.displaying a large red flag
B.displaying three black balls in a vertical line
C.sounding four or more short rapid blasts on the whistle
D.continuously sounding the fog whistle
单项选择题
Which condition represents the appropriate time for setting off distress flares and rockets? （）
A.At one hour intervals
B.At half hour intervals
C.Only when there is a chance of their being seen by rescue vessels
D.Immediately upon abandoning the vessel
单项选择题
When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）
A.After determining that the frequency or channel appears to be no longer in use
B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
单项选择题
A vessel，which does not normally engage in towing operations，is towing a vessel in distress. She（）.
A.need not show the lights for a vessel engaged in towing，if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing
单项选择题
A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.
A.danger，stay away
B.all is clear，it is safe to pass
C.all is clear，it is safe to approach
D.a distress signal
单项选择题
Distress flares and smoke signals for small passenger vessels（）.
A.are not required aboard vessels on runs of less than 30 minutes duration
B.must be Coast Guard approved and stowed in a portable，watertight container
C.must be marked with an expiration date not more than 42 months from the date of manufacture
D.All of the above
单项选择题
When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.
A.10 minutes
B.1 minute
C.1 hour
D.3 minutes
单项选择题
According to the “Vessel Bridge-to-Bridge Radiotelephone Act”，your radiotelephone log must contain（）.
A.a record of all routine calls
B.a record of your transmissions only
C.the home address of the vessel's Master or owner
D.a summary of all distress calls and messages
单项选择题
All of the following are recognized distress signals under the Navigation Rules EXCEPT（）.
A.a green star signal
B.orange-colored smoke
C.red flares
D.the repeated raising and lowering of outstretched arms