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    精英家教网 > 初中数学 > 题目详情
    27、The following graph shows the air temperature in some place during 24hours in January．
    Can you tell me
    （1）When was the temperature-3℃？
    （2）When was it warmest？
    （3）When was the temperature zero？
    分析：（1）从图象上可以直接看到温度在-3℃时的时间；
    （2）可直接从图象上看到温度最高时的时间；
    （3）温度在0℃的时间有三个时间点，看图象与x轴的交点．
    解答：解：（1）前一天晚上12点和当天早上8点；
    （2）当天下午2点；
    （3）前一天晚上8点，当天早上9点和当天下午6点．
    点评：此题主要考查了函数图象，关键是同学们要首先了解横纵坐标所表示的意义，然后再看图象．
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