海船船员考试
单选题Details of coast radio stations and radar stations can be found in（）.A Admiralty ChartB Admiralty Light listC Admiralty List of Radio SignalsD Admiralty Notices to Mariners
题目
Admiralty Chart
Admiralty Light list
Admiralty List of Radio Signals
Admiralty Notices to Mariners
相似问题和答案
第1题：
B.overlook
C.submit
D.admire
第2题：
all ships in a large sea area
only the sea authorities ashore
the SAR units ashore and at sea
the port radios and the coast stations
第3题：
Which two statements describe the operation of the CSMA/CD access method, which is in use on the Ezonexam network? (Choose two)
A. After a collision, the station that detected the collision has first priority to resend the lost data.
B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.
C. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.
D. The use of hubs to enlarge the size of collision domains is one way to improve the operation of the CSMA/CD access method.
E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.
F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.
B,E 解析：Explanation:
Ethernet networking uses Carrier Sense Multiple Access with Collision Detect (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium. CSMA/CD was created to overcome the problem of those collisions that occur when packets are transmitted simultaneously from different nodes. And trust me, good collision management is crucial, because when a node transmits in a CSMA/CD network, all the other nodes on the network receive and examine that transmission.
Only bridges and routers can effectively prevent a transmission from propagating throughout the entire network! So, how does the CSMA/CD protocol work? Like this: when a host wants to transmit over the network, it first checks for the presence of a digital signal on the wire. If all is clear (no other host is transmitting), the host will then proceed with its transmission.
But it doesn't stop there. The transmitting host constantly monitors the wire to make sure no other hosts begin transmitting. If the host detects another signal on the wire, it sends out an extended jam signal that causes all nodes on the segment to stop sending data (think, busy signal). The nodes respond to that jam signal by waiting a while before attempting to transmit again. Backoff algorithms determine when the colliding stations can retransmit. If collisions keep occurring after 15 tries, the nodes attempting to transmit will then time out.
第4题：
every two years
every three years
every year
every four years
第5题：
receiving messages/one station
transmission/ one coast station or ship
communicating /one ship
contacting/other
第6题：
B.installing
C.equipped
D.installed
第7题：
SAR party and the ship in distress
SAR authorities and the ship in distress and survival craft
A ship station and any coast station
Ship stations and shore-based communication network
第8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9题：
orbiting satellites in space
commercial radio stations
private，commercial，and military aircraft
ordinary radio stations
第10题：
No, it receives the MSI from ship stations
Yes, it can
only with NBDP terminal, can it receives the MSI sent from coast stations
No, it can not receive the MSI sent from coast stations