Which statement concerning GPS is TRUE（）.<br>A:It cannot be used in all parts of the world<br>B:There are 12 functioning GPS satellites at present<br>C:It may be suspended without warning<br>D:Two position lines are used to give a 2D fix

Which statement concerning GPS is TRUE（）.
A:It cannot be used in all parts of the world
B:There are 12 functioning GPS satellites at present
C:It may be suspended without warning
D:Two position lines are used to give a 2D fix

出自：海船船员证

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