单选

A ship operating in sea area A1 must have the following provisions of maintenance:

A.Shore maintenance
B.Duplication of equipment
C.At Sea Maintenance
D.Any one of these

试题出自试卷《GMDSS通信英语试题(1)》

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A ship operating in sea area A1 must have the following provisions of maintenance:
- A.Shore maintenance
- B.Duplication of equipment
- C.At Sea Maintenance
- D.Any one of these
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What is the basic concept of GMDSS?
- A.Search and rescue authorities shore can be alerted to a distress situation
- B.shipping in the immediate vicinity of a ship in distress will be rapidly alerted
- C.Shore-side authorities and vessels can assist in a coordinated SAR operation with minimum delay
- D.All of these
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Which system has the least effective radius of operation?
- A.HF SITOR
- B.MF NBDP
- C.VHF DSC
- D.NATTEX
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Which of the following systems is most likely to be subject to fading or static interference?
- A.HF NBDP
- B.INMARSAT
- C.Digital Selective Calling on channel 70
- D.VHF ARQ
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Which system is most likely to be affected by atmospheric disturbances?
- A.VHF DSC
- B.INMARSAT Standard-C
- C.MF/HF radiotelephony
- D.Safety NET
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Which system is least likely to be affected by atmospheric disturbances?
- A.NAVTES
- B.MF NBDP
- C.SES
- D.HF NBDP
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What is the minimum operation time of reserve source of energy on ships with an emergency energy source?
- A.1 hour
- B.6 hours
- C.12 hours
- D.24 hours
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Vessel operating in which sea area(s) are required to carry either INMARSAT or HF equipment or a combination thereof under GMDSS?
- A.All sea areas
- B.A3
- C.A4
- D.A3 and A4
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What is the primary purpose of the GMDSS?
- A.Environmental protection
- B.A common international communications system for all shipping
- C.Automate and improve emergency communications for the world’s shipping industry
- D.Effective and inexpensive communications
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What statement is generally correct regarding the maintenance requirements for ships under GMDSS?
- A.Redundancy of functions of certain equipment will partially meet this requirement
- B.On-board maintenance provided by a person holding a Second Class Electronic Certificate license will partially meet the requirements
- C.shore based maintenance and scheduled tests and inspections will partially meet this requirement
- D.All of these
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