网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
A
SOS
B
XXX
C
TTT
D
PAN
参考答案
参考解析
解析：
暂无解析
更多 “单选题The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.A SOSB XXXC TTTD PAN” 相关考题
考题
On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)A. The destination host sends a request to the source for retransmission.B. The jam signal indicates that the collision has been cleared.C. The hosts will attempt to resume transmission after a time delay has expired.D. An electrical pulse indicates that the collision has cleared.E. The router on the segment will signal that the collision has cleared.F. The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
考题
PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow? ______.A.DistressB.SafetyC.All clearD.Urgency
考题
International distress signal in VHF calling for help is________.A.Help,Help,HelpB.Mayday,Mayday,MaydayC.Save,Save,SaveD.Rescue,Rescue,Rescue
考题
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
考题
The safety signal used on the marine radiotelephone：Ⅰ．Consists of three repetitions of the word PAN transmitted before the call sign and name of the calling station．Ⅱ．Indicates a message concerning the safety of navigation or meteorological warnings．A.ⅠonlyB.ⅡonlyC.Both Ⅰand ⅡD.Neither Ⅰnor Ⅱ
考题
A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a ______.A.poor fixB.good fixC.poor signal qualityD.good signal quality
考题
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
考题
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 frequencyB.Distress frequencyC.Urgency frequencyD.Working frequency
考题
Donald Trump has signed an executiveorder ___________ a "large physical barrier" between the US andMexico.A.calling for
B.calling on
C.calling in
D.calling up
考题
On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A、The destination host sends a request to the source for retransmission.B、The jam signal indicates that the collision has been cleared.C、The hosts will attempt to resume transmission after a time delay has expired.D、An electrical pulse indicates that the collision has cleared.E、The router on the segment will signal that the collision has cleared.F、The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
考题
单选题International distress signal in VHF calling for help is（）.A
Help，Help，HelpB
Mayday，Mayday，MaydayC
Save，Save，SaveD
Rescue，Rescue，Rescue
考题
单选题Refer to the exhibit. A Cisco Aironet Wireless LAN Client Adapter has been installed and configured through the ADU on the PC. The Aironet System Tray Utility （ASTU） has been enabled during the installation and the icon appears in the system tray area in the lower right of the desktop. What is thesignificance of the icon？（）A
It indicates that the radio of the client adapter is disabledB
It indicates that the client adapter is not associated to an access point or another clientC
It indicates that the client adapter is associated to an access point or another client， but the user is not EAP authenticatedD
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is excellent or goodE
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is fairF
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is poor
考题
单选题If a ship station relays a DSC distress call to an appropriate coast station, it means that（）.A
the ship has received the DSC distress call on a HF frequencyB
the coast station concerned has not acknowledged it within 5 minutesC
the ship will take command of search and rescue in 5 minutesD
A and B
考题
单选题Refer to the exhibit. A Cisco Aironet Wireless LAN Client Adapter has been installed and configured through the ADU on the PC. The Aironet System Tray Utility （ASTU） has been enabled during the installation and the icon appears in the system tray area in the lower right of the desktop. What is the significance of the icon？（）A
It indicates that the radio of the client adapter is disabled.B
It indicates that the client adapter is not associated to an access point or another client. C
It indicates that the client adapter is associated to an access point or another client， but the user is not EAP authenticated.D
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is excellent or good.E
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is fair.F
It indicates that the client adapter is associated to an access point or another client， that the user is authenticated if the client adapter is configured for EAP authentication， and that the signal strength is poor.
考题
单选题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
考题
单选题Digital Selective Calling means a technique using（）which which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.A
digital codesB
code messagesC
norse codesD
distress messages
考题
单选题In the International Code of signals，a group of three letters indicates（）.A
urgency or an emergencyB
the vessel's national identity signalC
a group from the general signal codeD
a group from the medical signal code
考题
单选题We（）the distress signal on our own radio before the shore station relayed it to us.A
received alreadlyB
have receivedC
had receivedD
was receiving
考题
单选题The urgency signal concerning the illness of persons on board ship is（）.A
MaydayB
PanC
SecuriteD
Attention
考题
单选题On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A
The destination host sends a request to the source for retransmission.B
The jam signal indicates that the collision has been cleared.C
The hosts will attempt to resume transmission after a time delay has expired.D
An electrical pulse indicates that the collision has cleared.E
The router on the segment will signal that the collision has cleared.F
The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
考题
单选题A continuous sounding of a fog-signal apparatus indicates（）.A
the vessel is in distressB
the vessel has completed loading dangerous cargoC
it is safe to passD
the vessel is anchored
考题
单选题Which radiotelephone signal indicates receipt of a distress message?（）A
Roger wilcoB
Romeo，romeo，romeoC
SOS acknowledgedD
Mayday roger
考题
单选题A low HDOP (Horizontal Dilution of Precision) number such as 2 indicates a （）.A
poor fixB
good fixC
poor signal qualityD
good signal quality
考题
单选题In radiotelephone communications，the prefix PAN-PAN indicates that（）.A
a ship is threatened by grave and imminent danger and requests immediate assistanceB
a calling station has an urgent message about the safety of a personC
the message following the prefix will be about the safety of navigationD
the message following is a meteorological warning
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
热门标签
最新试卷