5 AB 的方向角為S50 40' 30'' E °,試計算 AB 的方位角?
(A)140° 40' 30''
(B)310° 40' 30''
(C)129° 19' 30''
(D)309° 19' 30''
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統計: A(6), B(5), C(51), D(5), E(0) #2354360
統計: A(6), B(5), C(51), D(5), E(0) #2354360