选C

92. In a properly functioning MF/HF DSC system the receive bandwidth should be ______

A. sufficiently wide to pass video pulses B. 1.7 kHz

C. as narrow as possible but not less than 170Hz D. 100Hz maximum (改为300) 选D

93.What is the least expensive per-minute call make via INMARSAT Standard-B? A. Ship to Shore Fax B. Ship to Ship Voice C. Ship to Shore TELEX D. Ship to Ship TELEX

选C

94. Every ship while at sea shall maintain a continuous watch on ____if the ship is fitted with an MF radio installation A. 2182 kHz B. 156.8 MHz C. 2187.5 kHz D. 2182.5 kHz 选A

95. There are ____for ships to receive SafetyNet message A. some charge B. a few charge C. more expensive D. no charge

选D

96.The initial distress message can be retransmitted on NAVTEX using subject Indicator character A. D B. A C. B D. C 选A

97.For communication between two stations the ______ mode should be used when available A. ARO B. FEC C. SEL-CALL D. EGC

选A

98.What should a GMDSS operator do if a NAVTEX warning message is received but it contains too many errors it to be usable? A.Vital message will be repeated

B.Contact the NAVAREA coordinator and request a request broadcast,then the message concerned will be repeated at once C.The hurricane will be upon the vessel,they’re in big troublr D.Listen to appropriate VHF weather channel for repeat warnings 选A

99.What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction? A.Relocate the mast or other obstruction B.Raise the transmit power level C.Change the ship’s course D.Increase the receiver gain

选C

100.What does ITU stand for? A.the International Telephone Union B.the International Telecommunication Union C.the International Telecommunication Unit D.the International Telex Unit 选B

101.INMAPSAT is composing of______ A.CES,SES,Satellite

B.Satellite,NCS,OCC,CES,and SES C.SES,Satellite,coast stations,and NCC D.SES,CES,coast station 选B