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解法1:2點15分,分針指在数字3上,分針水平,當2點30分時,分針指在数字6上,分針垂直於水平時的分針,故分針轉的角度是90°;解法2:因為鐘錶上的刻度是把一個圓平均分成了12等份,每一份是30°,從2點15分到2點30分分針轉過了三份,轉過的角度為3×30°=90°.故選D.
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