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【单选题】
坐标正算计算公式正确的是( )。A.
Δ x AB =D AB sin α AB ， Δ y AB =D AB cos α AB
B.
Δ x AB =D AB sin α BA , Δ y AB =D AB cos α BA
C.
Δ x AB =D AB COS α AB , Δ y AB =D AB sin α AB
D.
Δ x AB =D AB sin α BA , Δ y AB =D AB cos α BA
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