A. alteration B. alternative C. alter D. alert 选B

63.An area within the coverage of at least one VHF shore station in which continuous DSC distress alert is available is ______ A. Sea Area A1 B. Sea Area A2 C. Sea Area A4 D. distress Area 选A

64. There is actually an overlapped area of three ocean regions somewhere in the world It is an overlap of _______and_______

A. IOR AOR(E)/POR B. POR AOR(E)/IOR C. AOR(E) AOR(W)/IOR D. AOR(W) IOR/POR 选C

65,Frequencies for receiving MSI (Maritime safety information) internationally are_________

A. MF NBDP frequencies specified for MSI B. MF SSB frequencies specified for MSI C. HF NBDP frequencies specified MSI D. HF SSB frequencies specified fou MSI 选A

66.The position of the POR satellite in the Inmarsat is______above the equator

A.55.5W B.64.5W C.15.5W D.178E 选D

67.What is the minimum personnel requirement of GMDSS ships trading in sea area A2?

A.Restricted Operator’s Certificate B.General Operator’s Certificate

C.Second Class Radio Electronic Certificate D.First Class Radio Electronic Certificate 选B

68.What equipment is utilized to transmit Enhanced Group Cails? A.COSPAS satellite

B.HF SITOR shore stations C.NAVTEX shore stations D.INMARSAT satellite 选D

69.There are______NCSs in total,one in each ocean region,the AOR(E and W),IOR and POR A.3 B.2 C.1 D.4 选D

70.The INMARSAT safety-net service covers______ A.the whole world B.all NAVAREAS

C.areas from A1 to A2 D.only four Inmarsat regions 选D

71.A person______in spite of being in an extremely dangerous situation is a survivor A.whom is still alive B.who is sagety C.who is healthy D.who continues to live 选D

72.What is the minimum GMDSS personnel requirement of ships with Shore-Based Maintenance method operating in sea area A1? A.Restricted Operatou’s Certificate B.General Operator’s Certificate