單項(xiàng)選擇題

邊長(zhǎng)DMN=73.469m,方位角αMN=115°18′12,則XMN與YMN分別為()

A.+31.401m,+66.420m
B.+31.401m,66.420m
C.-31.401m,+66.420m
D.-66.420m,+31.401m

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