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GPS系统主要由、和三个部分构成。

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美国政府对不同GPS用户提供和。

δ技术干扰。

Please fill in the blanks with the right expression from thefollowing.(请从下列词汇表达中选择合适的，填入下面的句子中)recognized navigate specializes in accommodate make senseblend with reflect grasp1.If you ________ the problem ,you can solve it.如果你抓住问题，你可以解决它。

Please fill in the blanks with the right expression from thefollowing.(请从下列词汇表达中选择合适的，填入下面的句子中)recognized navigate specializes in accommodate make senseblend with reflect grasp2.Be cautions when you _________ the car on the mountain road.当你驾驶汽车走山路时一定要当心。