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单选题
The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.
A
navigational / typhoon
B
traffic / meteorological
C
marine / hurricane
D
navigational / meteorological
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以下哪个参数可以调整2A事件触发的难易度()
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以下哪个参数可以调整1C事件触发的难易度()
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Which statements are true regarding ISDN channels?()
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考题
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 channelB.Stations remaining off the air to safeguard proprietary informationC.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 J3ED.Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
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Which statement concerning satellite EPIRBs is TRUE ________．A.Once activated，these EPIRBs continuously send up a signal for use in identifying the vessel and for determining the position of the beaconB.The coded signal identifies the nature of the distress situationC.The coded signal only identifies the vessel's name and port of registryD.If the GMDSS Radio Operator does not program the EPIRB，it will transmit default information such as the follow-on communications frequency and mode
考题
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 useB.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsC.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedD.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
考题
以下哪个参数可以调整2A事件触发的难易度（）A、Absolute Threshold of the Quality ofthe Currently Used FrequencyB、Absolute Threshold of the Quality ofthe Non-used FrequencyC、HysteresisD、Weight of the Currently Used Frequency
考题
Which three flow-control port states lead to enabled link flow control？ （）A、 Receive port： Enabled， Transmit port： EnabledB、 Receive port： Enabled， Transmit port： DesiredC、 Receive port： Enabled， Transmit port： DisabledD、 Receive port： Disabled， Transmit port： DesiredE、 Receive port： Desired， Transmit port： Desired
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以下哪个参数可以调整1C事件触发的难易度（）A、Reporting Range ConstantB、WeightC、HysteresisD、Threshold used frequency
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Which statements are true regarding ISDN channels?（）A、Each B channel can transmit up to 64 kbpsB、The ISDN B channel carries voice or dataC、The ISDN D channel transmits control information.D、The D channel transmission rate varies depending on the service used.E、HDLC or PPP can be used to encapsulate D channel information.
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考题
单选题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 useB
After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsC
After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedD
Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
考题
单选题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 useB
After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsC
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 concludedD
If，in the Master's opinion，communications on that frequency will interfere with emergency communications
考题
单选题Diesel engines driving alternators operating in parallel must maintain set frequency regardless of load changesThe governor characteristic used to accomplish this is known as （）A
actuationB
sensitivityC
compensationD
thrust shaft
考题
多选题Which statements are true regarding ISDN channels?（）AEach B channel can transmit up to 64 kbpsBThe ISDN B channel carries voice or dataCThe ISDN D channel transmits control information.DThe D channel transmission rate varies depending on the service used.EHDLC or PPP can be used to encapsulate D channel information.
考题
单选题An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus （）A
The breaker should be closed when one synchronizing lamp is dark and the other is brightB
The breaker should be closed when both synchronizing lamps are brightC
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A portable phase sequence indicator must be used to verify the information from the lamps
考题
单选题A major advantage of the NAVTEX system when compared to other systems is that（）.A
the information can be received on an ordinary FM radioB
warnings are printed out for reading when convenientC
broadcasts are at scheduled timesD
a low frequency band is used for long distance transmission
考题
多选题Which three flow-control port states lead to enabled link flow control？ （）AReceive port： Enabled， Transmit port： EnabledBReceive port： Enabled， Transmit port： DesiredCReceive port： Enabled， Transmit port： DisabledDReceive port： Disabled， Transmit port： DesiredEReceive port： Desired， Transmit port： Desired
考题
单选题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 channelB
Stations remaining off the air to safeguard proprietary informationC
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 J3ED
Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
考题
单选题All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.A
every station in one chain to transmit at the same timeB
each station to transmit without reference to another stationC
on-line transmission of single-line transmitters at the same timeD
each station to only depend on the master for synchronization and signal ratio
考题
单选题Female frogs may not be attracted by the new call because _____.A
it is strange and unusualB
they are used to the old callC
the male frogs don’t know how to attract themD
lower frequency has special physical meaning
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