航海GMDSS英语阅读500题单选题一 第三部份 英语阅读 单项选择题
1. IMO has decided that all ships over 300TGt must be fitted with a NAVTEX receiver ______ .
A. by 01 Feb 1992 B. by 01 Aug 1993 C. between 01 Feb 1992 and 01 Feb 1999 D. before 01 Feb 1992 2. GMDSS is to provide ______ with reliable communication . A. all large passenger vessels
B. freighters of more than 300gt in coastal waters
C. all passenger ships and cargo ships engaged in international-voyages D. all passenger ships and cargo ships of 300gt upwards in open sea
3. The complying vessels can transmit ship-to-shore distress alerts by at least ______ .
A. One means, whether satellite or terrestrial techniques B. Two means, whether satellite or terrestrial techniques
C. Two separate and independent means, each using different radio communication services D. Two means, such as MF DSC and HF DSC
4. The quality of the message can be affected by ______ .
A. climate B. sunshine C. human beings D. both a and b 5. Within the polar areas it is ______ to see a satellite in geo-stationary orbit .
A. impossible B. possible C. easy D. difficult 6. The Inmarsat system is open for use by ______ countries on a
non-discriminatory basis .
A. some B. lots of C. many D. all
7. With the help of GMDSS ______ can be alerted to a distress incident as soon as possible .
A. all ships in a large sea area B. only the sea authorities ashore C. the SAR units ashore and at sea D. the port radios and the coast stations 8. In areas covered by Inmarsat HF can be used as an ______ to satellite communications.
A. alternation B. alternate C. alter D. alternative 9. When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will ______ in a coordinated search and rescue operation with the minimum delay .
A. assist B. send a rescue vessel
C. search the distress area D. reach the distress position at once 10. In which year was the COSPAS-SARSAT system established ? A. 1980 B. 1981 C. 1979 D. 1982
11. It is quite ______ for an SES operator to send a distress alert . A. easy and expensive B. simple and certain C. dangerous and stable D. difficult and compulsory
12. Any ships fitted with SES can ______ and _______ through the satellite system when sending a distress alert . A. enter the system / contact an RCC
B. access to INMARSAT / establish contact with a CES
C. have absolute priority to enter the system / make contact with a CES
D. enter the system gradually / wait for rescue
13. What’s the advantage when using the satellites ? A. The message can be directed to the desired location B. The message can follow the earth’s curvature C. The quality of message can not be affected by climatic
D. The range of the message extend and the quality of reception is improved 14. The DSC frequency for distress alerting in Area A2 is ______ . A. 2182KHZ B. 2174.5KHZ C. 2192KHZ D. 2187.5KHZ 15. What channel is general communication used ? A. any appropriate channel except public communication B. any appropriate channel except for public communications C. any appropriate channel besides public communication D. any appropriate channel beside public communication 16. why do some stations keep silence ?
A. Because they are not engaged in the distress traffic B. they will affect the transmission of the distress traffic C. The powers of these stations are very weak D. They are not in charge of search and rescue
17. General radio communications in the global system are those between ______ concerning the management and operation of the ships and may have impact on their safety .
A. SAR party and the ship in distress
B. SAR authorities and the ship in distress and survival craft C. A ship station and any coast station
D. Ship stations and shore-based communication network
18. It is required that ships proceeding at sea should keep continuous watch on ______ .
A. VHF channels 16 and 13 B. Appropriate DSC distress and safety frequencies C. INMARSAT TDM message channel D. VHF channel 70 and channel 8
19. The ARQ mode should be applied ______ . A. when two stations communicate with each other B. in any radio system and at any time
C. when one ship sends a message to another station D. for communication among some stations
20. What information will a distress alert contain ? A. nature of distress
B. type of assistance required
C. course and speed and time at which the information was recorded D. A, B, C are all right
21. A radio determination system based on the comparison of reference signals with radio signals reflected , or retransmitted from the position to be determined, is ______ .
A. DF B. Radar System C. DSC System D. COSPAS-SARSAT 22. With the help of modern technology, ships are able to receive automated broadcast of safety messages ______.
A. by day or at night B. almost round the clock C. somewhat and sometime D. from sunrise and sunset
23. The WWNWS is a coordinated global service for the broadcast by radio of vital information on ______ to marine navigation.
A. ship’s movement B. safety C. ship’s management D. hazards
24. distress alerts will be relayed on the ______ when the RCC considers it necessary .
A. dedicated system B. MSI broadcasts C. 518KHZ D. channel 16 25. The frequency 518KHZ will be used to transmit ______ and ______ wanings in NAVTEX .
A. navigational / typhoon B. traffic / meteorological C. marine / hurricane D. navigational / meteorological 26. It is possible for ships to receive safety message transmitted by Navtex station ______ .
A. in any INMARSAT regions B. in each NAVTEX area C. at any distance D. in Areas A3 and A4
27. A Navtex station in each NAVAREA is usually allowed to have ______ for transmission .
A. 10 minutes every 4 hours B. half an hour every other hour C. irregular period of time D. 5 minutes every two hours 28. The difference between international and national Navtex Service is limited to ______ .
A. frequency allocated B. both language and frequency C. language used D. transmission power and time 29. Navtex transmitter identification character ______ is used to identify the
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