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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)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.
解答: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.
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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