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GM cannot be used as an indicator of stability at all angles of inclination because ______.
A.M is not fixed at large angles
B.there is no M at large angles
C.G is not fixed at large angles
D.there is no G at large angles
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单选题GM cannot be used as an indicator of stability at all angles of inclination because（）.A
M is not fixed at large anglesB
there is no M at large anglesC
G is not fixed at large anglesD
there is no G at large angles
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It cannot be used in all parts of the worldB
There are 12 functioning GPS satellites at presentC
It may be suspended without warningD
Two position lines are used to give a 2D fix
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