单选题The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.Anavigational / typhoonBtraffic / meteorologicalCmarine / hurricaneDnavigational / meteorological
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
参考解析
解析：
暂无解析
相关考题：
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
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
A thrust bearing is used with a propulsion diesel engine to ____.A.control axial movement of the crankshaftB.transmit engine thrust to the propeller shaftC.absorb vibrations in the propeller shaftingD.prevent propeller thrust from being transmitted to the hull
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.
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
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
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
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
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
Which of the following cable types is used to transmit data from a satellite dish to the satellite modem?（）A、CAT5eB、CAT3C、FiberD、RG-6
设置PDCCH信道是否使用发射分集的参数是（）A、Cell Open-loop Spatial Multiplexing Used IndicatorB、Transmit Diversity Indicator for Common ChannelC、Cell transmit Diversity Used IndicatorD、Cell Closed-loop Spatial Multiplexing Used Indicator
What is used to prevent ‘ping-pong effects’, that is, rapid, successive handovers? （）A、Discontinuous TransmissionB、HysteresisC、Dynamic Power ControlD、Frequency HoppingE、Cell Load Sharing
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.
Which of the following protocols define the rules and processes used to transmit and receive block storage applications over TCP/IP？（）A、iSCSIB、VoIPC、Distributed Applications over IPD、HTTPS
An optical cable is used to transmit：（）A、digital audio from a component to a receiver.B、analog video from a component to a receiver.C、analog audio from a component to a receiver.D、digital video from a component to a receiver.
单选题When can routine communications be resumed on a frequency or channel on which radio silence has been imposed? （）AAfter determining that the frequency or channel appears to be no longer in useBAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsCAfter the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concludedDRoutine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications
单选题When can routine communications be resumed when radio silence has been imposed?（）AAfter determining that the frequency or channel appears to be no longer in useBAfter determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communicationsCRoutine 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 concludedDIf，in the Master's opinion，communications on that frequency will interfere with emergency communications
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 （）AactuationBsensitivityCcompensationDthrust shaft
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.
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 （）AThe breaker should be closed when one synchronizing lamp is dark and the other is brightBThe breaker should be closed when both synchronizing lamps are brightCThe frequency meter should be used to determine that the incoming alternator frequency is slightly higher than the busDA portable phase sequence indicator must be used to verify the information from the lamps
单选题A major advantage of the NAVTEX system when compared to other systems is that（）.Athe information can be received on an ordinary FM radioBwarnings are printed out for reading when convenientCbroadcasts are at scheduled timesDa low frequency band is used for long distance transmission
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
单选题What is meant by the term “radio silence”?（）AStations not directly involved with the on-going distress communications may not transmit on the distress frequency or channelBStations remaining off the air to safeguard proprietary informationCTwo 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 J3EDCommunications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
单选题All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.Aevery station in one chain to transmit at the same timeBeach station to transmit without reference to another stationCon-line transmission of single-line transmitters at the same timeDeach station to only depend on the master for synchronization and signal ratio
单选题Female frogs may not be attracted by the new call because _____.Ait is strange and unusualBthey are used to the old callCthe male frogs don’t know how to attract themDlower frequency has special physical meaning