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單項(xiàng)選擇題

競賽科目照相點(diǎn)扇形區(qū)，是以轉(zhuǎn)彎點(diǎn)為其頂點(diǎn)的（）一個(gè)地面象限

A.30°
B.45°
C.60°
D.90°
E.180°

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