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？

解：（1）前一天晚上12點和當天早上8點；
（2）當天下午2點；
（3）前一天晚上8點，當天早上9點和當天下午6點．
分析：（1）從圖象上可以直接看到溫度在-3℃時的時間；
（2）可直接從圖象上看到溫度最高時的時間；
（3）溫度在0℃的時間有三個時間點，看圖象與x軸的交點．
點評：此題主要考查了函數(shù)圖象，關(guān)鍵是同學(xué)們要首先了解橫縱坐標所表示的意義，然后再看圖象．
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