1492 kHz
1892 kHz
2082 kHz
2182 kHz
第1题：
What is the position of the vessel________distress?
A.on
B.at
C.in
D.by
第2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3题：
The maximum data rate of any single wireless link can be described by the shannon’s theorem which is related to the（）in hertz，and the（）on the channel
A．signal frequency B．bandwidth C．carrier frequency D．noise frequency A．signal B．caeeier C．noise D．data signal
第4题：
What can cause a thread to become non-runnable？（）
第5题：
What is nominal central frequency?
第6题：
What is meant by the term“radio silence”________．
A.Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel
B.Stations remaining off the air to safeguard proprietary information
C.Two three-minute silent periods，at 15 and 45 minutes after the hour，that provide a transmitting“window”for distressed vessels to transmit distress alerts using J3E
D.Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
第7题：
If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies, which frequency should you call on ?______.
A.Calling frequency
B.Distress frequency
C.Urgency frequency
D.Working frequency
第8题：
International distress signal in VHF calling for help is________.
A.Help,Help,Help
B.Mayday,Mayday,Mayday
C.Save,Save,Save
D.Rescue,Rescue,Rescue
第9题：
What is the frequency of the front side bus （FSB） on the eX4 architecture？（）
第10题：
667 MHz
533 MHz
1066 MHz
333 MHz