【简答题】Which feature,when set to zero,might allow a GPS unit to have an accuracy equivalent to Precise Positioning Service receiver capability?A. Transit B. Selective Availability C. Auto-correlation D. A...
【简答题】(任务型阅读) 阅读下面的短文,并根据短文后的要求答题(请注意问题后的字数要求)。 Safety in the highway is not totally out of hands. Here are four ways we can protect ourselves when we travel. You are safer in a large car. People in small c...