单项选择题

Some radio waves（）the surface of the earth because of its（）.

A.are capable of following / distance
B.can follow / altitude
C.can hardly follow / shape
D.are unable following / angle

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单项选择题

Ships equipped with Inmarsat SES send distress alerts both（）.

A.quick and good
B.convenient and certain
C.easily and simply
D.important and difficult

单项选择题

In addition to communication equipment, the GMDSS will introduce requirements of SARTs and EPIRBs designed to improve the（）.

A.living standards
B.survival condition
C.chance of survival
D.technical specification

单项选择题

The GMDSS must combine all various subsystems, because（）.

A.they all have different limitations with respect to coverage
B.they all have different limitations in the technology they use
C.different systems apply to different ships
D.all of above