A
分析:利用鐘表表盤的特征解答.分針每轉(zhuǎn)動1°時針轉(zhuǎn)動(
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)°.
解答:2點15分,分針指在數(shù)字3上,分針?biāo)剑?br />當(dāng)2點30分時,分針指在數(shù)字6上,分針垂直于水平時的分針,故分針轉(zhuǎn)的角90°,
而分針每轉(zhuǎn)動1°時針轉(zhuǎn)動(
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)°,
∴時針轉(zhuǎn)過的角度為(
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)°×90=7.5°.
故選A.
點評:本題考查鐘表分針?biāo)D(zhuǎn)過的角度計算.在鐘表問題中,常利用時針與分針轉(zhuǎn)動的度數(shù)關(guān)系:分針每轉(zhuǎn)動1°時針轉(zhuǎn)動(
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)°,并且利用起點時間時針和分針的位置關(guān)系建立角的圖形.