导航轴系的原点为地球表面的某一点 x轴指向正北 y轴指向正东 则z轴指向 The Origin of the Navig
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导航轴系的原点为地球表面的某一点，x轴指向正北，y轴指向正东，则z轴指向 The Origin of the Navigational System is located on the surface of the Earth. The x axis points towards the local north, the y axis points towards the local east, and the z axis points .
A．正西 towards local west
B．正南 towards local south
C．地心 to the center of the Earth
D．上 upward
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地心