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7點30分45度傳統鐘錶錶盤共12刻度,360°除以12等於30°.即每兩個刻度間的度數為30°.4點30分時,分針指在六點位置,時針在四點與五點的正中位置,所以夾角即為30°+15°=45°.7點30分時,分針指向六點位置,時針指在七點…
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