The line connecting the Loran-C master station with a secondary station is called the ______．A.Focus lineB.Base lineC.Side lineD.Center line
The line connecting the Loran-C master station with a secondary station is called the ______．
A.Focus line
B.Base line
C.Side line
D.Center line
相关考题：
Irish broadcasting began in ______ in a small studio called Dublin Broadcasting Station. A.1906B.1916C.1926D.1936
The data station usually means a(71)unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72)control functions.In(73)data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74)by the primary station, interprets received commands and (75) responses to be transmitted.A．performanceB．functionalC．capacityD．quality
In 8011 terminology．all communication was to go through the base station, called an(75)A．Access ChannelB．Access SystemC．Access PointD．Network Access Point
Diameter路由代理(DRA)在Cx接口支持基于哪个AVP进行寻址? A.User-NameB.Public-IdentityC.Called-Station-IdD.User-IdentityE.Framed-IPv6-Address
ETA/PILOT REVERTING means:A.ETA pilot station has been givenB.ETA pilot station will be given afterwardsC.ETA pilot station was not givenD.ETA pilot station is given
It is the responsibility of the Master or person in charge of a ship to ensure that ______.A.the station bill is posted in each compartmentB.temporary personnel and visitors are advised of emergency stationsC.names of crew members are listed on the station billD.no changes are made to the station bill
Most modern Loran-C receivers，when not tracking properly，have a（n）______．A.Bell alarm to warn the userB.Lighted alarm signal to warn the userC.Alternate signal keying systemD.View finder for each station
The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of ______．A.High frequency pulsesB.Combinations of high and low frequency pulsesC.The same frequency for all stations in a chainD.Varied long and short pulses
In multipoint networks , there are tree persistence methods when a station finds a channel busy.in the 1-persistent method,after the station finds the line idle,it sends its frame immediately.this method has the （ ） chance of collision because two or more stations may find the line （请作答此空） and send their frames immediately. In the nonpersistent method , a station that has a frame to send （ ） the line . If the line is idle , it sends immediately If the line is not idle , it waits a （ ） amount of time and then senses the line again.The nonpersistent approach （ ） the chance of collision because it is unlikely that two or more stations will wait the same amount of time and retry to send simultaneously The p-persistent approach combines the advantages of the other two strategies . It reduces the chance of collision and improves efficiency.A.idleB.busyC.usefulD.unusable
Which combination of ports is available on the Cisco SPA 8800 voice gateway？（）A、 four station ports and four trunk ports （4xFXS and 4xFXO）B、 two station ports （2xFXS）C、 eight station ports （8xFXS）D、 one station port and one trunk port （1xFXS and 1xFXO）
单选题Which combination of ports is available on the Cisco SPA 8800 voice gateway？（）A four station ports and four trunk ports （4xFXS and 4xFXO）B two station ports （2xFXS）C eight station ports （8xFXS）D one station port and one trunk port （1xFXS and 1xFXO）
单选题ETA／PILOT REVERTING means （） ．AETA pilot station has been givenBETA pilot station will be given afterwardsCETA pilot station was not givenDETA pilot station is given
单选题Diesel engine control can be obtained by the bridge （）.Aat any timeBonly after the engine room control station is switched to “bridge control”Cwhenever the secondary station is switched to bridge controlDwith the approval of the chief engineer only
单选题Where must the master or person in charge of a ship record the date of each test of emergency lighting and power systems and the condition and performance of the equipment（）.AOn the Certificate of InspectionBOn the station billCIn the Operations ManualDIn either the official or unofficial log
单选题The pushbutton on the handset of a ships sound-powered telephone must be depressed to （）.Atalk then released to listenBlisten then released to talkCboth talk and listenDring the station being called
单选题A mobile earth station in the maritime mobile-satellite service,which is located on board ship,is called（）.Aan LESBan SESCa ship stationDa Land Mobile Station
单选题Main diesel engine control can be obtained by the bridge （）Aat any timeBonly after the engine room control station is switched to ‘bridge control’Cwhenever the secondary station is switched to ‘bridge control’Dwhenever the engine side control station is switched to ‘bridge control’
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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The line connecting the Loran-C master station with a secondary station is called the（）.AFocus lineBBase lineCSide lineDCenter line
单选题Most modern Loran-C receivers，when not tracking properly，have a（n）（）.ABell alarm to warn the userBLighted alarm signal to warn the userCAlternate signal keying systemDView finder for each station
单选题It is the responsibility of the Master or person in charge of a ship to ensure that（）.Athe Muster List (Station Bill) is posted in each compartmentBtemporary personnel and visitors are advised of emergency stationsCnames of crew members are listed on the Muster List (Station Bill)Dno changes are made to the Muster List (Station Bill)
单选题It is the responsibility of the Master or person in charge of a ship to ensure that（）.Athe station bill is posted in each compartmentBtemporary personnel and visitors are advised of emergency stationsCnames of crew members are listed on the station billDno changes are made to the station bill