turn it off for 5 minutes every half-hour
turn it off and on at 5 minute intervals
turn it off during daylight hours
leave it on continuously
第1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
第2题：
You created a report from the human resources department based on all the columns in the EMP table. After viewing the report users requested that the cmp_ID columns peers first in the output. How would you change the position of the column?（）
第3题：
The Emergency Position Indicating Radiobeacon on a cargo vessel must be stowed ______.
A.in an inside passageway
B.in an approved bracket
C.so that it is accessible from the bridge of the vessel
D.so that it will float free if the vessel sinks
第4题：
NAVETEX receiver
Search and Rescue Transponder
Emergency Position Indicating Radio Beacon
Digital selective calling
第5题：
one year
two years
four years
five years
第6题：
第7题：
Immediately
After one hour
Only when another vessel is in sight
Only after sunset
第8题：
When should the emergency position-indicating radio beacon be activated after abandoning an OSV ________．
A.Immediately
B.After one hour
C.Only when another vessel is in sight
D.Only after sunset
第9题：
turn it off for five minutes every half-hour
turn it off and on at five-minute intervals
turn it off during daylight hours
leave it on continuously
第10题：
initiate a ship-to-shore security alert
transmit a ship-to-shore security alert
initiate an alert identifying the ship, its location
raise a security alarm on-board the ship indicating that the ship is under threat