單項(xiàng)選擇題AB分別代表巷道曲線(xiàn)的起點(diǎn)和終點(diǎn),巷道寬3.750米,圓心角90°,曲線(xiàn)半徑19.65米,取n=3,則兩中間點(diǎn)處的轉(zhuǎn)向角等于()

A.190°
B.185°
C.195°
D.210°


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