42.The safety radio certicate for the cargo ship is issued______ A.by the radiotelegraphy authority of a country B.in accordance with the government regulations

C.by complying with the provisions of the international conventions D.under the provisions of the SOLAS convention 选D

43.In the NAVTEX service,three messages priorities are used.They are______

A.Distress Urgency and Routime

B.Navigation Warning,Weather Report and General C.Distress,safety and Urgent priorities D.Vital,Important and Routine 选D

44.Which one of the following NAVTEX questions is false?

A.NAVTEX is a single frequency NBDP system that transmits FF? broadcasts on 518KHz

B.A selective message-rejection feature of the receiver allows the mariner to receive only that safety information pertinent to his requirements C.NAVTEX is breadcast only in the local language of the coast station and adjacent NAVAREAs

D.NAVTEX carries information relevant to all sizes and types of vessels witnin a region established for this service 选C

45.Which of the following statement is true? A.NAVTEX stations have the transmission power B.NAVTEX stations can transmit at the same time

C.every NATEX stations have the different identification characters in each NAVAREA

D.There are 24 NAVTEX stations in each NAVAREA

选C

46.EPRIB batteries must be clearly______with their expiry date,the serial number and the identification code A.noted B.written C.marked D.notified 选C

47.An “area call” is usually applied to______ A.alert all ships in a limite sea area B.all ships

C.send the alert to the ships in vicinity of distress incident D.several ships

选a

48.______has the right to impose silence on stations which interfere with distress traffic A.CES B.RCC C.OSC D.SES 选B

49.Radio beacon can be activated______in case of distress A.Only sutomatically(单词错误 sutomatically) B.Only manually

C.Both automatically and manually D.Only by remote control 选C

50.In the communication of INMARSAT,______communication has the absolute priority over all other transmissions A.routine B.distress C.urgency D.security 选B

51.Which mode of INMARSAT Standard-B communications may be possible with a lower received signal strength? A.Fax B.TELEX

C.Voice Communications,compandors off D.Voice Communications,compandors on 选B