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单选题
Independent Position Determining includes items such as inertial guidance systems, weather radar, doppler, proximity warning, collision avoidance, star tracker, etc. Also includes sextants/octants, etc.
A
自主式定位包括惯性制导系统、天气雷达、多普勒、接近预警、避撞、星体跟踪器等部分，以及六分仪/八分仪等。
B
自主式定位包括导向系统、天气雷达、多普勒、近地警告、避撞、星体雷达等部分，和六分仪/八分仪等。
C
自主式定位包括导向系统、天气雷达、多普勒、接近预警、避撞、星形跟踪器等部分，和六分仪/八分仪等。
答案解析
正确答案：A
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