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We learn from the passage that navigation computers ______. The navigation computer functions ______.
We learn from the passage that navigation computers ______. The navigation computer functions ______.
admin
2009-06-24
82
问题
We learn from the passage that navigation computers ______.
The navigation computer functions ______.
选项
A、by means of a direction finder and a speed detector
B、basically on satellite signals and a map database
C、mainly through the reception of turn-by-turn directions
D、by using a screen to display satellite signals
答案
B
解析
根据第四段可知,卫星信号和车轮速度传感器上输入的速度以及仪表上显示的的方向决定了汽车前进时的位置。这种信息与地图数据库结合起来 (决定汽车的位置)。地图数据库还包括街道、路标和风景点。所以导航电脑基本上是靠卫星信号和地图数据库发挥作用。
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