单项选择题

The source of energy fitted in GMDSS complying vessels must be（）.

A.the main source of energy
B.emergency source of electrical power
C.the reserve source of energy
D.all of above

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单项选择题

A.Goonhilly, UK
B.Yamaguchi, Japan
C.Perth, Australia
D.Southbury, USA

单项选择题

A.180E above the equator
B.64.5 E over the IOR
C.15.5W along the straight line
D.55.5W above the equator

单项选择题

A.complicated circumstances
B.changeable atmospheric pressure
C.large density of traffic
D.some strong signals from unwanted satellites